A Cancelled Plan Is Still a Reference: Extract, Do Not Revive
A cancelled plan can still be a source of guidance: explicit extraction with a do-not-lift list, while the source document stays frozen.
TL;DR
Team kept the cancelled plan frozen instead of reopening it. They extracted still-valid guidance into Section E of the live response with six reference items and an explicit do-not-lift list. The plan got only a backlink, preserving the audit trail while keeping useful content accessible.
A technical review once almost filed a cancelled implementation plan under "obsolete cargo". The problem: half its implementation detail was still the best available answer for work in flight, covering the storage schema, the history hook, and the estimation frame.
The first guess: just reopen the cancelled document, or quietly copy the good parts into the new one. Both fail differently. Reopening a frozen document destroys its value as a record; copying in silence smuggles in old requirements that may already be substituted.
What the team did was both at once, but tidy. Plan v1 stayed cancelled and its body untouched. The guidance still valid was extracted explicitly into one new section of the live response document: section E, holding six reference items (E1 through E6) plus an explicit "do-not-lift" list for plan v1 items already substituted by spec v2. The frozen plan received exactly one thing: a backlink in its frontmatter.
Controlled extraction, not resurrection
This pattern follows the document lifecycle convention already covered here: frozen documents are never edited, and a revision creates a new document [1]. Section E is the living side of that rule. Instead of reviving the old document, its valuable content moves into the document that is allowed to change.
The "do-not-lift" list is the component people skip most. Without it, extraction runs both ways: obsolete items get dragged along and reappear weeks later as "requirements" that had already been settled. With it, every item's status is explicit. What may be used is named in E1 through E6, what may not is listed with its reason, and anything unnamed was simply never evaluated.
Two scenarios, not equally priced
Test the two options available at the time. Reopen the plan: all information sits in one place, but the decision trail vanishes, and a new engineer cannot see that the feature was once considered and dropped for a specific reason. Leave the plan intact and link its guidance into the active document: readers must open two documents, but the audit trail stays clear, the decision history is readable, and the old document remains trustworthy as a record.
The cost of opening two documents is far cheaper than the cost of an archive nobody can trust. That is why the choice landed on extraction: section E lives in the response document, the frozen plan just gets a backlink.
Mine the quarry, do not reopen the pit
A document whose place has been taken is not a tomb; it is a quarry. Its value can be taken in full, as long as the digging goes through an explicit lift-list in a document that is genuinely alive. The pit stays closed, because the greatest function of a cancelled document is to be proof that its cancellation was actually thought through.