Contract strictness trades integration velocity and late-stage risk.
+------------------+----------------+----------------+----------------+
| Approach | Strength | Weakness | Best when |
+------------------+----------------+----------------+----------------+
| Strict | predictable | slower early | new program |
| Balanced | practical | needs rigor | stable teams |
| Aggressive | fast | escape risk | late schedule |
| Re-architect | durable | expensive | recurring failures |
+------------------+----------------+----------------+----------------+Pick the approach based on residual silicon risk, not only schedule pressure.
Policy-only arguments without artifact evidence
Unbounded waivers
INTEGRATION EVIDENCE MATRIX — Hierarchy Abstraction Boundaries
+-------------------+------------------------+--------------------------+-------------------------+
| Evidence | Tells you | Does not prove | Next action |
+-------------------+------------------------+--------------------------+-------------------------+
| Manifest diff | baseline changed | root cause itself | isolate first delta |
| Domain trace | where behavior diverged| ownership accountability | map to contract owner |
| Signoff dashboard | closure posture | reproducibility quality | verify source artifacts |
| Bring-up logs | software-visible symptom| physical/timing cause | correlate with HW trace |
| Waiver register | accepted residual risk | technical closure | review expiry criteria |
+-------------------+------------------------+--------------------------+-------------------------+Budget and ownership contracts are technical artifacts, not PM slides.
HIERARCHY CONTRACT FLOW
partition -> block budget -> owner signoff -> integration checkpointBUDGET RISK TREND
open risks ████████
owned fixes ███████
unowned risks ██budget delta dashboard
ownership matrix
milestone health report
risk register
A timing overrun was solved only after budget ownership moved from shared to single-threaded.
Validate contract revision
Check owner signatures
Audit milestone readiness
Ask: what baseline, owner, and artifact prove this topic is truly closed?
State baseline manifest and owner with every closure metric.
Run cross-domain regression after every top-level fix.
Comparing results across different manifests.
Unowned issues slipping through review cycles.
Waiving risks without expiry and validation plan.
Abstraction boundaries define what each team exposes (timing models, interfaces, constraints) and what remains internal implementation detail.
Metric: cross-boundary ECO count, abstraction violation escapes
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