A Period That Regenerates
A closed month should give the same answer twice. Most companies cannot reproduce last quarter's numbers -- rates changed, a formula was corrected, a spreadsheet moved. The figures still exist; they simply cannot be regenerated. Fix that one thing and a plan becomes testable.
The accounting side is not a second system -- it is the plan, one layer out, running the same five points as a release for the same reasons. Strategy pairs with pricing; release pairs with period; deliverable pairs with statement; feature pairs with customer. releaseLock and periodLock both freeze a set at the moment of commitment -- one freezes which work belongs, the other freezes which events belong to the period -- and everything keeps arriving afterwards, which is expected, not a failure. releaseClose and periodClose are both the proof: a hash never set before every member carries its own. The dateChangeLog is identical on both sides -- append-only, and it survives the lock.
Cost splits into four buckets: serving a paying customer, in margin and with an owner; winning it -- demos and trials, never a cost of serving, below margin but still owned; running the business itself -- test environments, back office, below margin with no owner; and waiting -- capacity built that is not yet earning, which a named strategy owns. Without that fourth bucket, capacity held on purpose and capacity held by mistake are the same number. A closed period pins four things: the rates applied, the allocation rules used, the calculation-engine version, and the market-thesis version -- move any one of them underneath a closed number and last quarter becomes irreproducible. A closed period is not recomputed: a change in estimate is prospective and flows forward as an adjustment, so the record shows both what was believed and what was learned, not only the second. A material error is the one exception -- it produces a visible, versioned superseding period, never a silent rewrite.
Four of the five reconciliation checks a real close runs need no customer data at all -- only the fifth, everything against what was earned, does.
A company that can close a period cleanly can change its prices, reallocate its spending and reprice a market in the same quarter it decides to -- because none of those moves can damage what is already closed.
The cycle is the capability -- not the reports it produces, but the fact that it closes, and that closing costs nothing you are afraid of. Each close produces one number per strategy: how far the plan missed. That series cannot be backfilled.