Phase 0 — Modernization Master Plan

Strategic framework for cloud governance modernization

1. Executive Summary

The Unified Identity-Addressing-Overlay (UIAO) Modernization Master Plan establishes the strategic framework for transforming the organization's cloud governance posture through a single, integrated overlay architecture. UIAO unifies the identity, device, network, security, evidence, and compliance planes into a cohesive modernization framework that replaces fragmented, incrementally adopted cloud services with an architecturally coherent governance model. This Phase 0 Planning Document defines the scope, problem space, objectives, deliverables, risks, and next steps required to initiate Phase 1 execution.

The modernization program pursues five primary goals. First, the program will stabilize identity services by unifying identity governance across Microsoft Entra ID (formerly Azure Active Directory) and on-premises Active Directory (AD), ensuring consistent Conditional Access evaluation and full Multi-Factor Authentication (MFA) enforcement across all access scenarios. Second, the program will restore network and telemetry visibility by eliminating signal gaps that result from authorization boundary constraints, enabling end-to-end correlation of identity, device, network, and application-layer events. Third, the program will enable Zero Trust Architecture (ZTA) alignment as defined by Office of Management and Budget (OMB) Memorandum M-22-09, establishing continuous verification of identity, device health, and session context at every policy enforcement point. Fourth, the program will achieve Secure Cloud Business Applications (SCuBA) baseline compliance for all Microsoft 365 services, with UIAO SCuBA providing a governance orchestration layer that consumes Cybersecurity and Infrastructure Security Agency (CISA) ScubaGear outputs and delivers continuous drift detection, canonical desired-state management, remediation orchestration with Service Level Agreement (SLA) enforcement, and machine-trackable governance provenance. Fifth, the program will establish continuous Authorization to Operate (ATO) capability, transitioning from the traditional periodic reauthorization cycle to an ongoing authorization posture supported by automated evidence streams and real-time risk assessment.

A structural dependency underlies the entire modernization effort: the FedRAMP Boundary Gap. The current Federal Risk and Authorization Management Program (FedRAMP) authorization boundary was established to encompass legacy infrastructure and does not fully capture the cloud-native signal sources required for modern governance. Identity correlation, session telemetry, location awareness, and policy enforcement all depend on signals that originate from sources spanning multiple trust zones, some of which fall outside the defined boundary. This gap is not an operational deficiency; it is an architectural condition that reflects the natural progression from legacy to cloud-native service delivery. Until the boundary is modernized to encompass all required signal sources, the program cannot achieve its full objectives.

As of Q1 2026, FedRAMP has begun this modernization formally. The Minimum Assessment Scope Standard (RFC-0005, comment period closed 2025-05-25) replaces traditional boundary policy with a two-pronged inclusion test — handles federal information, and/or likely impacts its confidentiality, integrity, or availability — and explicitly excludes most metadata. The FedRAMP 20x Phase Two Moderate Pilot (active November 2025; public Moderate path Q2 2026) introduces approximately sixty-one Key Security Indicators (KSIs) at Moderate baseline as machine-readable, continuously-validated evidence sitting above NIST SP 800-53. Goal #2 of this Master Plan now operates against that federal mechanism: the boundary-modernization conversation shifts from can the data leave? to is the receiving service in scope of the agency’s authorization, and does the substrate emit the KSI evidence that demonstrates continuous compliance? Operational substrate treatment of this framework movement is recorded in FINDING-002 — FedRAMP 20x Moderate Pilot active. Framework movement does not yet ship product features into GCC-Moderate; companion product action by cloud service providers is still required to close the operational telemetry inventory tracked in FINDING-001.

The UIAO Modernization Program operates within the FedRAMP Moderate boundary in Commercial Cloud. Government Community Cloud – Moderate (GCC-Moderate) applies exclusively to Microsoft 365 Software as a Service (SaaS) services and does not encompass Azure services. Amazon Connect Contact Center operates as an explicit exception within Commercial Cloud. The program is aligned with federal mandates including Executive Order (EO) 14028 (Improving the Nation's Cybersecurity), CISA SCuBA, FedRAMP Revision 5 (Rev5), and OMB M-22-09. This document serves as the authoritative planning artifact for all stakeholders, including the Chief Information Officer (CIO), Chief Information Security Officer (CISO), Information System Security Officer (ISSO), Authorizing Official (AO), and Third-Party Assessment Organization (3PAO).

2. Modernization Scope

The UIAO Modernization Program organizes its scope across ten distinct planes and capability areas. Each plane represents a functional domain within the overlay architecture, and each carries its own current-state challenges and modernization objectives. The following subsections define the role, present condition, and target state for every component within the UIAO scope.

2.1 Identity Plane

The Identity Plane encompasses Microsoft Entra ID, Conditional Access policies, MFA enforcement, and the full identity lifecycle management framework, including provisioning, de-provisioning, role assignment, and access reviews. This plane serves as the foundational trust anchor for the entire UIAO architecture; every access decision, compliance evaluation, and security signal ultimately traces back to an authenticated identity.

Baseline assumption — AD→Entra ID synchronization is already operational. Per existing federal direction, agencies operating Microsoft 365 / Azure have already been required to establish AD-to-Entra ID synchronization (Entra Connect Sync or Entra Cloud Sync). Phase 0 treats the operational sync itself as a pre-existing baseline, not as a new deliverable. The fragmentation Phase 0 addresses is governance fragmentation layered on top of an already-operational sync — not the absence of synchronization.

In the current state, identity governance signals are fragmented across on-premises Active Directory and the cloud directory. This fragmentation means that Conditional Access policies cannot evaluate signals that originate outside the authorization boundary, resulting in incomplete policy evaluation for users and devices that traverse trust zone boundaries. Federation metadata, token issuance events, and Conditional Access evaluation data are generated across multiple infrastructure components, and the lack of a unified identity governance model prevents consistent policy enforcement even when the underlying directory sync is healthy. The modernization objective for the Identity Plane is to establish unified identity governance with full signal fidelity, ensuring that every identity event, regardless of its origin, is captured, correlated, and available for policy evaluation in real time. Where appropriate, Phase 0 also covers the migration from Entra Connect Sync to Entra Cloud Sync as the strategic sync mechanism, but the AD→Entra sync itself is not in scope as a greenfield activity.

2.2 Device Plane

The Device Plane covers Microsoft Intune Mobile Device Management (MDM) and Mobile Application Management (MAM), device compliance policy enforcement, and endpoint health attestation. Device compliance is a critical input to Conditional Access evaluation: a device that cannot demonstrate compliance should not be granted access to protected resources. In the current state, devices operating outside the managed boundary lack the compliance telemetry required for real-time health evaluation. Endpoint health signals, including operating system patch level, antivirus status, disk encryption state, and firmware integrity, are not consistently collected for all device populations. This creates a condition where Conditional Access policies must either permit access with incomplete device context or block access broadly, degrading user experience without proportionate security benefit. The modernization objective is to establish continuous device compliance with real-time health signals feeding directly into Conditional Access evaluation, ensuring that every device presenting for access can be assessed against a current, comprehensive compliance baseline.

2.3 Server Plane

The Server Plane addresses on-premises server infrastructure, hybrid connectivity architecture, and domain controller operations. Domain controllers remain a critical dependency for authentication services, Group Policy processing, and legacy application support. In the current state, legacy server infrastructure creates dependencies that constrain cloud migration velocity. Applications that rely on on-premises domain controllers for authentication cannot be migrated to cloud-native hosting without first establishing a hybrid identity bridge that maintains authentication continuity. Server operating system versions, patch compliance, and configuration baselines vary across the server fleet, creating an inconsistent security posture that complicates governance. The modernization objective is to rationalize the server footprint, establish a hybrid identity bridge between on-premises Active Directory and Entra ID, and enable phased decommissioning of legacy server infrastructure as application dependencies are resolved. This rationalization will reduce the attack surface, simplify governance, and remove architectural constraints that impede cloud adoption.

2.4 Routing Plane

The Routing Plane encompasses network topology, Wide Area Network (WAN) optimization, Domain Name System (DNS) resolution, and traffic routing policies that govern how user traffic reaches cloud services. In the current state, legacy WAN routing forces traffic through centralized inspection points, a design pattern inherited from perimeter-based security architectures. This centralized routing degrades cloud service performance for users at headquarters and field offices by introducing unnecessary latency and creating single points of congestion. Additionally, centralized inspection obscures session-level telemetry because traffic metadata is aggregated at inspection points rather than captured at the point of origin. Split-tunnel Virtual Private Network (VPN) configurations further complicate visibility by creating traffic paths that bypass some inspection and logging infrastructure. The modernization objective is to modernize routing to support direct cloud connectivity with preserved security inspection, enabling users to reach cloud services through optimized network paths while maintaining the visibility and inspection capabilities required for security operations and compliance evidence collection.

2.5 Security Plane

The Security Plane integrates Microsoft Defender for Endpoint, Microsoft Defender for Office 365, Microsoft Defender for Identity, and Microsoft Sentinel as the Security Information and Event Management (SIEM) and Security Orchestration, Automation, and Response (SOAR) platform. Together, these components provide threat detection, investigation, and response capabilities across the endpoint, email, identity, and cloud application layers. In the current state, these security tools generate rich signal streams that cannot be fully correlated when boundary constraints limit the scope of telemetry collection. Defender for Identity may detect suspicious authentication patterns, but if the corresponding network session telemetry or device compliance state is unavailable due to boundary constraints, the investigation context is incomplete. Sentinel correlation rules that depend on cross-layer signal joins produce partial results, reducing detection efficacy and increasing analyst workload. The modernization objective is to achieve unified security operations with full signal correlation across identity, device, network, and application layers, ensuring that every detection, alert, and investigation has access to the complete signal context required for accurate threat assessment and response.

2.6 Evidence Plane

The Evidence Plane governs audit logging, compliance evidence collection, and the generation of continuous monitoring artifacts required for FedRAMP authorization and ongoing oversight. Evidence is the bridge between operational reality and compliance documentation; without reliable, automated evidence streams, compliance artifacts cannot accurately reflect the system's security posture. In the current state, evidence collection is manual, periodic, and disconnected from operational telemetry. Compliance evidence is gathered during assessment preparation cycles, often through manual screenshots, configuration exports, and narrative documentation that capture a point-in-time snapshot rather than a continuous record. This approach introduces latency between operational changes and evidence capture, creating windows during which the documented compliance posture may not reflect actual system configuration. The modernization objective is to establish automated, continuous evidence generation mapped to FedRAMP Rev5 control families. Evidence streams will be produced as a byproduct of normal system operations, ensuring that compliance artifacts are always current, machine-readable, and traceable to their source telemetry.

2.7 Compliance Plane

The Compliance Plane manages FedRAMP authorization artifacts, including the System Security Plan (SSP), Plan of Action and Milestones (POA&M), and continuous monitoring deliverables. This plane is responsible for maintaining the documentation and evidence chains that demonstrate the system's compliance with applicable federal security requirements. In the current state, compliance artifacts are static documents that drift from operational reality between assessment cycles. The SSP is updated periodically rather than continuously, meaning that configuration changes, new service deployments, and architectural modifications may not be reflected in the compliance documentation until the next assessment preparation cycle. POA&M items are tracked in spreadsheets or document repositories that are disconnected from the operational systems they reference, making it difficult to verify remediation status in real time. The modernization objective is to establish machine-trackable compliance artifacts with drift detection and automated remediation orchestration, ensuring that the SSP, POA&M, and continuous monitoring deliverables remain synchronized with the operational environment at all times.

2.8 Drift Detection

Drift Detection within the UIAO framework is delivered through UIAO SCuBA, the governance orchestration layer that operates above and complements CISA ScubaGear. UIAO SCuBA is not a replacement for ScubaGear; it is the governance orchestration layer that consumes ScubaGear's JavaScript Object Notation (JSON) and Comma-Separated Values (CSV) outputs and extends their utility into continuous operational governance. UIAO SCuBA provides continuous drift detection against canonical desired-state baselines, remediation orchestration with SLA enforcement, owner accountability tracking, and machine-trackable governance provenance that creates an auditable chain from detection through remediation. In the current state, configuration drift is detected retroactively during periodic assessments rather than continuously. ScubaGear assessments produce point-in-time snapshots of Microsoft 365 configuration compliance, but without a governance orchestration layer, those snapshots are consumed manually and remediation is tracked through ad hoc processes. The modernization objective is to establish real-time drift detection with SLA-enforced remediation workflows and owner accountability, ensuring that configuration deviations from the canonical desired state are identified immediately, assigned to responsible owners, and remediated within defined SLA windows with full provenance tracking.

2.9 Continuous ATO

Continuous ATO represents the transition from the traditional periodic reauthorization model to a continuous authorization posture in which the Authorizing Official maintains ongoing visibility into the system's security state and can make authorization decisions based on current, real-time risk data rather than periodic assessment snapshots. In the current state, the traditional three-year ATO cycle creates compliance gaps between assessment events. During the interval between assessments, the system may undergo significant changes, including new service deployments, configuration modifications, personnel changes, and threat landscape evolution, that are not reflected in the authorization decision until the next assessment cycle. This creates a condition where the authorization decision is based on historical data that may no longer accurately represent the system's risk posture. The modernization objective is to establish continuous ATO capability with automated evidence streams, real-time control monitoring, and ongoing risk assessment. This capability will enable the AO to maintain continuous situational awareness of the system's security posture and make informed, timely authorization decisions supported by current evidence rather than periodic snapshots.

2.10 Boundary Modernization

Boundary Modernization addresses the structural evolution of the FedRAMP authorization boundary itself. The authorization boundary defines the scope of the system that is subject to FedRAMP assessment and continuous monitoring. All components, data flows, and interconnections within the boundary must be documented, assessed, and continuously monitored; components outside the boundary are excluded from this governance framework. In the current state, the authorization boundary was drawn around legacy infrastructure and does not encompass the cloud-native signal sources that modern governance requires. As cloud services were adopted incrementally, new signal sources, including identity federation endpoints, device compliance streams, session telemetry collectors, and policy decision points, were deployed in locations that fall outside the defined boundary. This creates a structural condition where the boundary no longer fully represents the system's operational footprint. The modernization objective is to propose boundary modifications that capture all signal sources required for modern cloud governance, including identity, location, session, telemetry, media, and policy signals. This boundary evolution will enable the UIAO Modernization Program to achieve its full scope of objectives within a coherent, assessable, and continuously monitored authorization perimeter.

3. Problem Statement

The organization operates a hybrid identity and infrastructure environment in which cloud services have been adopted incrementally over multiple years without a corresponding modernization of the authorization boundary, network architecture, or governance framework. This incremental adoption has produced an environment where cloud-native services coexist with legacy infrastructure, each operating under governance models that were designed independently and at different points in the organization's technology evolution. The result is an architectural condition in which the governance framework, the authorization boundary, and the operational environment are no longer fully aligned.

Signal Loss. The most consequential manifestation of this misalignment is signal loss. Modern cloud governance depends on the ability to correlate signals across multiple domains: identity signals (who is requesting access), device signals (what is the health and compliance state of the requesting device), session signals (what is the behavioral context of the session), location signals (where is the request originating), and application signals (what resource is being accessed and what actions are being performed). In the current environment, these signals originate from sources that span multiple trust zones, some of which fall outside the current FedRAMP authorization boundary. When signals originate outside the boundary, they cannot be formally incorporated into governance decisions, compliance evidence, or security operations workflows. This signal loss is not a failure of any individual system or tool; it is a structural consequence of an authorization boundary that was defined before cloud-native signal sources existed.

Visibility Gaps. Security operations require unified visibility across all layers of the technology stack to detect, investigate, and respond to threats effectively. In the current state, telemetry collection is constrained by boundary definitions that predate cloud adoption. Microsoft Sentinel, serving as the SIEM and SOAR platform, can only correlate signals that are available within its collection scope. When device compliance telemetry, network session metadata, geolocation data, or identity federation events fall outside the boundary, Sentinel correlation rules operate with incomplete data. Detection rules that depend on cross-layer signal joins, such as correlating an anomalous sign-in event with an endpoint health degradation and a network location change, produce partial or absent results. This reduces detection efficacy, increases false negative rates, and forces security analysts to perform manual cross-referencing that automated correlation should handle.

Architectural Constraints. Legacy WAN routing architecture forces user traffic through centralized inspection points, a pattern designed for perimeter-based security models where all traffic traversed a defined network edge. In a cloud-first environment, this routing pattern introduces latency for cloud service access, degrades user experience at headquarters and field offices, and creates congestion at centralized inspection infrastructure. Split-tunnel VPN configurations, adopted to mitigate some of these performance impacts, create traffic paths that bypass inspection and logging infrastructure, further reducing visibility. DNS resolution policies that direct traffic to centralized resolvers rather than cloud-optimized endpoints add additional latency and reduce the effectiveness of cloud service geo-optimization features.

These conditions, taken together, represent structural challenges that require architectural remediation. They are not the result of operational failures, misconfigurations, or resource constraints. They are the predictable consequences of an environment that has evolved from legacy to hybrid to cloud without a corresponding evolution of the governance and boundary architecture that governs it. The UIAO Modernization Program is designed to address these structural conditions through a unified architectural framework that aligns the authorization boundary, governance model, and operational environment into a coherent, assessable, and continuously monitored system.

4. FedRAMP Boundary Gap — Architectural Dependency

Critical Architectural Dependency The FedRAMP Boundary Gap is a prerequisite condition that must be addressed for the UIAO Modernization Program to achieve its objectives. This section provides the neutral architectural analysis required for AO and 3PAO review.

The current FedRAMP authorization boundary was established to encompass legacy infrastructure at a time when the organization's technology footprint was predominantly on-premises. The boundary definition captured the servers, network devices, databases, and application platforms that constituted the system, along with the interconnections and data flows between them. As cloud services were adopted, certain signal sources were deployed in environments that fall outside the originally defined boundary. These signal sources include identity federation endpoints, device compliance telemetry streams, session telemetry collectors, media relay infrastructure, geolocation services, and policy decision points. The deployment of these signal sources outside the boundary was not an error; it reflected the standard deployment architecture for cloud-native services that did not exist when the boundary was originally defined.

4.1 Categories of Missing Signals

The Boundary Gap can be characterized by six categories of signals that are generated outside the current authorization boundary but are required for modern cloud governance:

Signal Category	Description
1. Identity Signals	Federation metadata, token issuance events, Conditional Access evaluation data, and identity risk scores generated by Entra ID during authentication and authorization workflows.
2. Location Signals	Geolocation data, Internet Protocol (IP) reputation scores, named location evaluations, and network location awareness data used to assess the geographic and network context of access requests.
3. Session Signals	Session duration metrics, re-authentication events, token refresh patterns, and session risk evaluations that provide behavioral context for ongoing access sessions.
4. Telemetry Signals	Endpoint health attestation data, application performance metrics, service availability indicators, and infrastructure health signals from cloud-hosted management planes.
5. Media Signals	Microsoft Teams and communication media relay paths, call quality metrics, media transport telemetry, and real-time communication session data traversing cloud relay infrastructure.
6. Policy Signals	Conditional Access policy evaluation results, compliance gate decisions, risk-based policy application outcomes, and governance policy enforcement telemetry.

4.2 Impact on Cloud Behavior

Without these six signal categories within the authorization boundary, the organization's cloud governance capabilities operate with structural limitations. Conditional Access policies, which serve as the primary policy enforcement mechanism for cloud service access, evaluate access requests using the signals available to them. When identity risk scores, device compliance state, network location context, or session behavioral data are unavailable or incomplete, Conditional Access policies must make enforcement decisions with partial information. This results in one of two suboptimal outcomes: policies are configured conservatively, blocking legitimate access and degrading user experience; or policies are configured permissively, allowing access that would be denied if full signal context were available.

Zero Trust evaluations, as defined by OMB M-22-09, require continuous verification of identity, device, and context at every access decision point. When the signals required for this continuous verification originate outside the boundary, the verification is inherently incomplete. Security operations teams, operating through Microsoft Sentinel, cannot achieve the signal correlation density required for modern threat detection when correlation rules span signal domains that cross the boundary. The result is an environment where the technical capabilities of the security tooling exceed the governance framework's ability to consume and act on the signals those tools produce.

4.3 Compliance Implications

FedRAMP Rev5 control families impose requirements that depend on comprehensive signal availability. The Access Control (AC) family requires evidence of access enforcement at all system entry points. The Audit and Accountability (AU) family requires comprehensive audit logging of security-relevant events. The Identification and Authentication (IA) family requires evidence of identity verification and credential management. The System and Communications Protection (SC) family requires evidence of communication channel protection and session management. The System and Information Integrity (SI) family requires evidence of continuous monitoring and flaw remediation. When signal sources for any of these control families fall outside the authorization boundary, the evidence chain is incomplete. Assessment findings that result from this incompleteness are structural rather than operational: they reflect the boundary definition rather than a failure to implement or operate controls correctly.

4.4 Boundary Gap as Modernization Prerequisite

The UIAO Modernization Program cannot achieve its stated objectives — unified identity governance, continuous ATO, Zero Trust alignment, or SCuBA baseline compliance — until the authorization boundary is modernized to encompass all required signal sources. Each program objective depends on the availability of signals from multiple categories outlined above. Unified identity governance requires identity signals and policy signals. Continuous ATO requires evidence signals from all control families, which in turn depend on telemetry, session, and identity signals. Zero Trust alignment requires continuous verification using identity, device, location, and session signals. SCuBA baseline compliance requires policy signals, telemetry signals, and drift detection data. The Boundary Gap is therefore not a peripheral concern or a parallel workstream; it is the foundational architectural dependency upon which all other modernization objectives rest. Resolving it is not a deficiency remediation; it is an architectural evolution that reflects the natural and expected progression from legacy infrastructure governance to cloud-native governance.

5. Objectives and Outcomes

The UIAO Modernization Program defines six primary objectives, each with a measurable outcome statement that establishes the target state for that capability area. These objectives are interdependent; achieving any single objective in isolation provides limited value, while achieving them collectively produces a governance posture that meets all applicable federal requirements and enables sustained operational excellence.

5a. Stabilize Identity

Outcome: Unified identity governance across Entra ID and on-premises Active Directory with consistent Conditional Access evaluation and full MFA enforcement for all user populations, including privileged, standard, and external identities. Identity lifecycle events, including provisioning, role changes, and de-provisioning, will be managed through automated workflows with audit trails that satisfy FedRAMP Rev5 IA and AC control family requirements.

5b. Restore Visibility

Outcome: End-to-end telemetry correlation across identity, device, network, and application layers with no signal gaps attributable to authorization boundary constraints. Microsoft Sentinel will ingest and correlate signals from all six signal categories defined in Section 4, enabling detection rules, investigation workflows, and automated response playbooks to operate with complete contextual data.

5c. Enable Zero Trust Architecture

Outcome: Policy enforcement at every access decision point with continuous verification of identity, device health, and session context as defined by OMB M-22-09. Conditional Access policies will evaluate the full signal context, including identity risk, device compliance, network location, and session behavior, for every access request without exception. No access decision will be made with incomplete signal context due to boundary constraints.

5d. Enable SCuBA Alignment

Outcome: All Microsoft 365 services assessed against CISA SCuBA baselines with UIAO SCuBA providing continuous drift detection, remediation orchestration, and governance provenance. GCC-Moderate applies exclusively to Microsoft 365 SaaS services. UIAO SCuBA will consume CISA ScubaGear JSON and CSV outputs on a continuous basis, compare results against canonical desired-state configurations, identify deviations, assign remediation ownership, enforce SLA-based remediation timelines, and maintain machine-trackable provenance records that document the full lifecycle of every drift event from detection through resolution.

5e. Enable Continuous ATO

Outcome: Transition from the traditional periodic three-year reauthorization cycle to continuous authorization with automated evidence streams, real-time control monitoring, and ongoing risk assessment. The AO will have access to a continuously updated risk dashboard that reflects the current security posture of the system, enabling authorization decisions to be informed by real-time data rather than periodic assessment snapshots. The 3PAO will have access to continuous evidence streams that support ongoing assessment activities.

5f. Improve User Experience

Outcome: Reduced latency for cloud services at headquarters and field offices through routing modernization, elimination of unnecessary traffic backhauling through centralized inspection points, and a consistent authentication experience regardless of user location. Users will experience seamless access to Microsoft 365 and other cloud services with authentication flows that are predictable, performant, and secure. Routing modernization will ensure that users connect to cloud services through optimized network paths while security inspection and logging requirements are maintained through modern, distributed inspection architectures.

6. Deliverables

The UIAO Modernization Program Phase 0 produces the following deliverables, each of which serves as an input to Phase 1 execution planning and stakeholder decision-making. These deliverables are designed to provide the CIO, CISO, ISSO, AO, and 3PAO with the documentation required to authorize Phase 1 initiation.

6a. UIAO Architecture Document

A complete technical architecture document defining all UIAO planes (Identity, Device, Server, Routing, Security, Evidence, and Compliance), their integration points, data flows between planes, and governance touch points where policy decisions are made and evidence is collected. The architecture document will include logical architecture diagrams, data flow descriptions, component inventories, and interface specifications for each plane. This document serves as the authoritative technical reference for the UIAO overlay architecture.

6b. Boundary Modernization Plan

A detailed proposal for authorization boundary modification, including a complete signal source inventory identifying every signal source that requires boundary inclusion, a risk assessment evaluating the impact of boundary modification on the system's security posture, and a stakeholder approval pathway defining the review and approval process for boundary changes. This plan will address each of the six signal categories identified in Section 4 and provide a phased approach to boundary expansion that maintains authorization continuity throughout the transition.

6c. Compliance and ATO Plan

A roadmap for transitioning from periodic reauthorization to continuous ATO, including the evidence automation strategy that defines how continuous evidence streams will be generated for each FedRAMP Rev5 control family, a control mapping that aligns UIAO components to applicable controls, and a 3PAO engagement plan that defines how the assessment organization will participate in the continuous monitoring and ongoing authorization process.

6d. Signal Restoration Framework

A technical framework defining how each of the six missing signal categories (identity, location, session, telemetry, media, and policy) will be captured at their point of origin, routed through secure collection infrastructure, and integrated into the governance boundary. The framework will specify collection mechanisms, transport protocols, storage requirements, retention policies, and integration points with Microsoft Sentinel, Conditional Access, and the UIAO SCuBA governance orchestration layer.

6e. 90-Day Execution Timeline

A phased execution plan covering the first 90 days of Phase 1 implementation, organized into 30-day increments with defined milestones, dependencies, and decision gates at each phase boundary. The timeline will identify critical-path activities, resource requirements, stakeholder review points, and go/no-go decision criteria that must be satisfied before advancing to the next phase increment.

7. Risks and Dependencies

The following risk register identifies the primary risks and dependencies associated with the UIAO Modernization Program. Each risk is assessed for likelihood and impact, and paired with a mitigation strategy. These risks are structural in nature and reflect the complexity inherent in modernizing a hybrid environment while maintaining operational continuity and compliance posture.

ID	Risk	Likelihood	Impact	Description	Mitigation
R-01	Boundary Signal Constraints	High	High	The boundary modification timeline may exceed the modernization schedule, delaying signal restoration and blocking dependent objectives.	Parallel-path planning with interim compensating controls that provide partial signal coverage while boundary modification proceeds through the approval process.
R-02	Legacy WAN Routing	Medium	High	Legacy routing architecture may not be modifiable without service disruption to users at headquarters and field offices during transition.	Phased routing changes with documented rollback capability at each stage. Changes will be implemented during maintenance windows with pre-validated rollback procedures tested in a non-production environment.
R-03	Telemetry Limitations	Medium	Medium	Existing telemetry infrastructure may not support the continuous monitoring requirements of the UIAO framework without additional instrumentation.	Instrumentation gap analysis conducted during Phase 1 to identify collection gaps, followed by phased deployment of collection agents and log forwarding infrastructure to address identified gaps.
R-04	Region Drift	High	Medium	Cloud service configurations may drift from the canonical desired state between governance cycles, creating compliance gaps that are not detected until the next assessment.	UIAO SCuBA continuous drift detection consuming CISA ScubaGear outputs with SLA-enforced remediation workflows, owner accountability tracking, and governance provenance to ensure deviations are identified and resolved within defined timeframes.
R-05	Identity Continuity	Medium	High	Identity migration from fragmented on-premises and cloud directories to unified governance may create authentication disruptions for users during transition.	Staged migration with parallel identity infrastructure maintained throughout the transition period. Automated rollback capability will be pre-configured at each migration stage, and user authentication continuity will be validated before decommissioning parallel infrastructure.
R-06	Compliance Evidence Gaps	Medium	Medium	Evidence automation may not cover all FedRAMP Rev5 control families at initial launch, creating gaps in the continuous monitoring evidence chain.	Prioritized control mapping that automates evidence generation for the highest-impact control families first, with manual evidence collection procedures documented and staffed for uncovered controls during the transition to full automation.

7.1 Risk Narrative

The risks identified above are interdependent. The Boundary Signal Constraints risk (R-01) is the highest-impact item because it affects the timeline for nearly every other modernization objective. If the boundary modification process requires longer than anticipated, the program must operate with compensating controls that provide partial signal coverage, which in turn limits the effectiveness of the Restore Visibility (5b) and Enable Zero Trust Architecture (5c) objectives. The Legacy WAN Routing risk (R-02) has a direct relationship with the Improve User Experience (5f) objective and an indirect relationship with signal restoration, as routing modernization is required to enable direct telemetry collection from cloud service access paths.

The Region Drift risk (R-04) is specifically addressed by the UIAO SCuBA governance orchestration layer. By consuming CISA ScubaGear outputs on a continuous basis and comparing them against canonical desired-state configurations, UIAO SCuBA converts what would otherwise be a periodic, manual review process into a continuous, automated governance workflow. The Identity Continuity risk (R-05) requires careful staging because authentication disruptions have an immediate and visible impact on user productivity and organizational trust in the modernization program. The mitigation strategy of parallel identity infrastructure ensures that the existing authentication path remains available until the new path is fully validated.

The Compliance Evidence Gaps risk (R-06) is expected to diminish over time as evidence automation matures. The mitigation strategy acknowledges that full automation of evidence generation across all FedRAMP Rev5 control families is a progressive capability that will be achieved through iterative development rather than a single deployment event. During the transition period, manual evidence collection will ensure that compliance obligations are met while automation is extended to additional control families.

8. Next Steps

Upon acceptance of this Phase 0 Planning Document by the CIO, CISO, ISSO, and AO, the UIAO Modernization Program Office will initiate the following sequenced actions to prepare for Phase 1 execution. These actions are ordered to respect dependencies: architecture must be defined before boundary modifications can be proposed, and compliance mapping must be completed before the execution timeline can be finalized.

1. Prepare Phase 1 Architecture Document. Expand the UIAO architecture from the conceptual framework described in this document to a detailed technical design. The architecture document will include integration specifications for each plane, deployment patterns for cloud and hybrid components, data flow diagrams showing signal paths across all six signal categories, and interface contracts defining how each plane communicates with adjacent planes. This deliverable is the prerequisite for all subsequent planning activities.

2. Prepare Boundary Modernization Appendix. Document all signal sources that require inclusion within the FedRAMP authorization boundary, organized by the six signal categories defined in Section 4. Each signal source will include a risk assessment evaluating the security implications of boundary inclusion, a technical description of the signal's origin and transport path, and a recommended approval pathway for AO review. This appendix will be submitted to the AO as a formal boundary modification request.

3. Prepare Compliance and ATO Alignment. Map all UIAO components to applicable FedRAMP Rev5 control families, identifying which controls are satisfied by each component and which controls require additional implementation. Develop the continuous monitoring strategy that defines how evidence will be generated, collected, validated, and presented to the AO and 3PAO on an ongoing basis. This mapping will inform the evidence automation development priorities for Phase 1.

4. Prepare 90-Day Execution Plan. Define execution milestones for the first 90 days of Phase 1, organized into three 30-day increments. Each increment will include specific deliverables, resource requirements, stakeholder review points, and go/no-go decision gates that must be satisfied before the program advances to the next increment. The execution plan will identify critical-path activities and dependencies to ensure that schedule risks are visible and manageable.

Document Status This Phase 0 Planning Document is Version 0.1 (Draft), dated April 2026. It is subject to review and revision by the CIO, CISO, ISSO, AO, and 3PAO. Upon approval, it will serve as the authoritative planning baseline for Phase 1 of the UIAO Modernization Program.

UIAO Controlled Version

Modernization 0.1

Master Plan — (Draft)

Phase 0 — April

Planning 2026

Document

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