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Chapter 39 — Architecture Change Control (ACC)

39.1 Purpose

This chapter establishes the constitutional governance framework for Architecture Change Control (ACC) within the Engineering Intelligence Platform.

Architecture Change Control governs all modifications affecting the constitutional governance of the Engineering Intelligence Platform after the Governance Baseline has entered the Frozen state.

Its purpose is to preserve constitutional stability while permitting controlled constitutional evolution when objectively justified.

39.2 Definition

Architecture Change Control (ACC) is the formal constitutional process governing changes to:

  • governance authority;
  • governance responsibilities;
  • governance relationships;
  • governance boundaries;
  • constitutional lifecycle;
  • constitutional governance principles.

ACC governs constitutional evolution.

Engineering evolution remains governed through Engineering Baselines.

39.3 Authority

Architecture Change Control derives its authority directly from the Engineering Constitution.

Engineering Constitution
        │
        ▼
Architecture Board
        │
        ▼
Architecture Change Control (ACC)
        │
        ▼
Approved Constitutional Revision

No organization, repository, automation system, or engineering tool may independently modify constitutional governance.

39.4 Objectives

Architecture Change Control shall ensure:

  • constitutional stability;
  • controlled constitutional evolution;
  • governance consistency;
  • objective decision-making;
  • complete traceability;
  • historical preservation.

39.5 Scope

ACC applies exclusively to constitutional governance changes.

Examples include:

  • changes to governance authority;
  • governance responsibilities;
  • governance organization;
  • governance lifecycle;
  • governance terminology;
  • governance relationships;
  • constitutional principles.

Engineering Specifications, Interface Contracts, ADRs, Verification Assets, Configuration Records, Release Packages, repositories, and toolchains remain outside ACC unless their modification changes constitutional governance.

39.6 Change Classification

Constitutional changes shall be classified as:

Editorial Change

Non-semantic improvements.

Examples:

  • spelling;
  • formatting;
  • grammar;
  • typography.

Version Policy:

v1.0.x

Constitutional Revision

Changes affecting constitutional governance while preserving the constitutional generation.

Examples:

  • governance responsibilities;
  • governance relationships;
  • governance definitions.

Version Policy:

v1.x.0

Constitutional Generation

Fundamental constitutional redesign.

Examples:

  • governance architecture;
  • constitutional philosophy;
  • governance model.

Version Policy:

v2.0.0

39.7 Change Process

Every constitutional change shall proceed through:

Change Proposal
        │
        ▼
Impact Assessment
        │
        ▼
Architecture Board Review
        │
        ▼
Board Resolution
        │
        ▼
Approval / Rejection
        │
        ▼
Controlled Implementation

No constitutional change shall bypass this process.

39.8 Impact Assessment

Each proposal shall evaluate impacts on:

  • governance authority;
  • governance relationships;
  • Engineering Baselines;
  • repositories;
  • toolchains;
  • documentation;
  • traceability;
  • configuration;
  • release governance.

The Architecture Board shall consider both technical and organizational impacts.

39.9 Decision Authority

The Architecture Board possesses exclusive authority to:

  • approve constitutional revisions;
  • reject constitutional revisions;
  • defer constitutional revisions;
  • request additional assessment.

Board decisions shall be formally recorded.

39.10 Traceability

Each Architecture Change shall maintain traceability to:

  • originating proposal;
  • impact assessment;
  • Board Resolution;
  • constitutional revision;
  • affected Engineering Baselines.

Historical constitutional decisions shall never be removed.

39.11 Governance Preservation

Unless approved through ACC:

  • Governance Authority remains unchanged.
  • Governance Relationships remain unchanged.
  • Governance Boundaries remain unchanged.
  • Constitutional Lifecycle remains unchanged.

Engineering evolution shall continue through controlled Engineering Baselines.

39.12 Chapter Summary

This chapter establishes Architecture Change Control (ACC) as the exclusive constitutional mechanism governing changes to the Engineering Constitution.

It confirms that:

  • constitutional governance remains stable after Design Freeze;
  • constitutional evolution requires Architecture Board approval;
  • engineering evolution proceeds independently through Engineering Baselines;
  • constitutional history is permanently preserved through controlled traceability;
  • the Engineering Constitution remains the highest governance authority throughout the Engineering Intelligence Platform lifecycle.