55-Decision & Change Log Template v1.0 | Chapter 8 Decision Essentials & Sign-off

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Chapter 8 Decision Essentials & Sign-off

I. Chapter Goals & Scope (Mandatory)

• Fix actionable decision outcomes and the signature chain, clarifying scope, exceptions, and exit conditions so they are auditable, replayable, and reusable for external communications.
• Stay aligned with Ch.4 (State Machine), Ch.5 (Option Comparison), Ch.6 (Impact), Ch.7 (Rollback). All citations use Volume + Version + Anchor (S/P/M/I).

II. Minimal Decision Set (Mandatory; provide each item)

• Decision: one-sentence, subject–verb–object (do / not-do / defer).
• Scope: list of affected objects (volumes/modules/interfaces/data contracts/regions/batches).
• Effectivity: effective date, ramp/rollout policy, expiry/review date (if any).
• Non-Do List: explicit exclusions and deferrals.
• Exceptions/Waivers: conditions, applicability, term, and re-check gates.
• Exit Conditions: triggers, revoke/rollback path, pre-gates for re-deployment.
• Dependencies & Anchors: impacted S/P/M/I anchors and system components.
• Gates & Monitoring: pass lines, windows, statistical caliber, script locators.
• Comms: internal/external audiences, channels, and timeline.
• Audit Elements: evidence list, hashes, versions, and exported artifacts (yaml/json/pdf).

III. Sign-off Roles & Permissions (RACI, Mandatory)

• Requester: submits motive/evidence and proposed ruling.
• Reviewer: provides consistency/risk/impact opinions (strong veto).
• Approver/Owner: final ruling and effectivity sign-off; accountable for exceptions/waivers.
• Implementer: execution & verification sign-off (responsible for effectiveness).
• Auditor: signs references, dimensional checks, gates, and audit trail.

IV. Effectivity Conditions & Clauses (Mandatory)

• Hard conditions: all hard gates pass (e.g., gate_accuracy>=0.99@7d, compat_rate>=0.995@replay); audit package complete.
• Soft conditions: may be met within a bounded window; must have Approver/Owner signature and compensating measures recorded.
• Validity/Review: upon expiry, enter review; failure triggers exit conditions.

V. Exception & Waiver Management (Mandatory)

1. Structured record: name, rationale, domain, term, re-check gates, owner.
2. Exceptions must not alter metrology caliber or path/measure definitions; if arrival-time appears, still use:
   • T_arr = ( 1 / c_ref ) * ( ∫ n_eff d ell ), or
   • T_arr = ( ∫ ( n_eff / c_ref ) d ell ),
     and declare gamma(ell) and d ell in the same paragraph.
3. Exceptions auto-expire or enter re-review at end of term.

VI. Exit Conditions & Revocation Flow (Mandatory)

• Example triggers: gate_accuracy<0.98@7d, gate_latency>2h@7d, incident_level≥2.
• Revocation steps: execute Ch.7 rollback flow; after completion, update this chapter’s sign-off page and issue a RollbackReport.

VII. Sign-off Page Templates (Copy-ready)

A. Human Sign-off Page

1. DR ID: DR-YYYY-NNNN
2. Decision: …
3. Scope: …
4. Non-Do List: …
5. Effectivity: Effective YYYY-MM-DD; rollout X%/day; review YYYY-MM-DD
6. Exceptions/Waivers: name — domain — term — re-check gates
7. Exit Conditions: triggers & rollback path
8. Dependencies & Anchors: "EFT.WP.Core.Equations v1.1:S20-1", "EFT.WP.Core.Metrology v1.0:check_dim" …
9. Gates & Monitoring: gate_accuracy>=0.99@7d, gate_latency<=2h@7d …
10. Signatures:
    • Requester: ____ Date: ____
    • Reviewer: ____ Date: ____
    • Approver/Owner: ____ Date: ____
    • Implementer: ____ Date: ____
    • Auditor: ____ Date: ____

B. Machine-Readable Sign-off (YAML; JSON equivalent)

signoff:

decision_id: "DR-2025-0123"

conclusion: "Adopt general T_arr form; record constant-factoring as exception."

scope:

volumes: ["Core.Equations","Core.Metrology"]

modules: ["pipeline.arrival_time"]

contracts: ["api.metrics.v2","dataspec.arrival_time"]

effective:

start: "2025-10-01"

rollout: { pace: "10%/day", regions: ["EU","APAC"] }

review_at: "2025-11-01"

non_do:

- "No change to API v1 consumers during rollout window"

exceptions:

- name: "Constant factoring allowed in Segment-L2"

domain: ["region:L2"]

until: "2025-10-31"

recheck_gates: ["compat_rate>=0.995@replay"]

owner: "Approver/Owner"

exits:

triggers: ["gate_accuracy<0.98@7d","incident_level>=2"]

rollback_ref: "RB-Playbook:v2"

dependencies:

anchors:

- "EFT.WP.Core.Equations v1.1:S20-1"

- "EFT.WP.Core.Metrology v1.0:check_dim"

gates:

hard: ["gate_accuracy>=0.99@7d","compat_rate>=0.995@replay"]

soft: ["unit_cost<=1.0x@30d"]

monitoring: ["gate_latency<=2h@7d","data_drift<=0.03@14d"]

communication:

internal: ["oncall","owner","auditor","release_mgr"]

external: { channels: ["status_page","mailing_list"], window: "T+2h" }

signers:

requester: { name: "", signed_at: "YYYY-MM-DD" }

reviewer: { name: "", signed_at: "YYYY-MM-DD" }

approver: { name: "", signed_at: "YYYY-MM-DD" }

implementer:{ name: "", signed_at: "YYYY-MM-DD" }

auditor: { name: "", signed_at: "YYYY-MM-DD" }

audit_artifacts:

exports: ["yaml","json","pdf"]

evidence_hash: "sha256:…"

VIII. Human × Machine Alignment (Mandatory)

IX. Minimal Filled Example (Copy-ready)

signoff:

decision_id: "DR-2025-0188"

conclusion: "Generalize T_arr; keep v1 adapter for 30 days."

scope: { volumes:["Core.Equations"], modules:["pipeline.arrival_time"] }

effective: { start:"2025-10-05", rollout:{ pace:"20%/day" }, review_at:"2025-11-05" }

non_do: ["No schema changes to api.metrics.v1"]

exceptions:

- { name:"L2 constant factoring", domain:["region:L2"], until:"2025-10-31",

recheck_gates:["compat_rate>=0.995@replay"], owner:"Approver/Owner" }

exits: { triggers:["gate_accuracy<0.98@7d"], rollback_ref:"RB-Playbook:v2" }

dependencies:

anchors: ["EFT.WP.Core.Equations v1.1:S20-1","EFT.WP.Core.Metrology v1.0:check_dim"]

gates:

hard: ["gate_accuracy>=0.99@7d"]

monitoring: ["gate_latency<=2h@7d"]

communication: { internal:["oncall","owner","auditor"], external:{ channels:["status_page"] } }

signers:

requester: { name:"Alice", signed_at:"2025-09-27" }

reviewer: { name:"Bob", signed_at:"2025-09-27" }

approver: { name:"Carol", signed_at:"2025-09-27" }

implementer:{ name:"Diego", signed_at:"2025-09-28" }

auditor: { name:"Erin", signed_at:"2025-09-28" }

audit_artifacts: { exports:["yaml","json","pdf"], evidence_hash:"sha256:…" }

X. Cross-Reference Style (Mandatory)

1. Fixed in-text format: “See 《 vX.Y》 Ch.x S/P/M/I…”, anchors preferred over whole volumes.
2. Provide a machine-readable list in the DR’s references.see (examples):
   • "EFT.WP.Core.Terms v1.0:P10-3"
   • "EFT.WP.Core.Equations v1.1:S20-1"
   • "EFT.WP.Core.Metrology v1.0:check_dim"
   • "EFT.WP.Core.DataSpec v1.0:I30-2"