What it is
A pace shape is the form a sell-through pace is expected to follow, and it is decided by what the commitment is. A boxed season declares a glidepath: points of cumulative sell-through by date, climbing to the finish line. A rolling commitment declares a corridor: a minimum and a maximum of weeks of cover the stock should sit between, week after week, because a standing book has no build date and no sell-down date. A wave is a boxed commitment that declares two points, a build-to by a date on the climb and a sell-down-to by a date on the descent. The climb is a share of the wave's buy received by its date; the descent is cumulative sell-through by its date. A wave may declare no envelope of its own, and then it claims no money and cannot own a dollar anything else owns.
Exactly one shape is present on a commitment, and Declare swaps the pace row to match: a continuity declaration asks for a cover corridor where a season asks for a glidepath, sent as one point at the window's end. Declare does not offer a wave.
How Tightly decides it
The shape is validated at declare time, in words. A glidepath needs at least one point; its dates must climb strictly; its targets are cumulative sell-through and may never fall; every point must lie inside the window. A corridor's maximum may not sit under its minimum. A wave's climb must come strictly before its descent, and both points must lie inside the window.
The compile preview binds each shape onto the engines that already run. A glidepath binds to the weekly defence, with the declared tolerance armed, or the engine's own default of 30% where none was declared; the demand drift flags elsewhere on the platform do not read it, and the preview says so. A corridor arms the replenishment engine's weeks-of-cover bounds, at the grain of a variant and channel carrying a live forecast, and is left unbound on a channel scope, whose cover cannot be measured. The weekly defence measures a glidepath against its interpolated target and a corridor as the share of variants outside it. It has no wave test yet, so a wave's anchor reads unbound with its reason; the binding still publishes the two tests a wave would arm, the climb on receipts and the descent on sell-through, because they have different remedies.
Tightly's suggestions read serves one pace figure, the book's trailing 180-day sell-through toward the window's end date. A corridor or a wave has no by-date target for that figure to sit against, so the record says not comparable rather than forcing a comparison.
The words on the face
| Word | What it means |
|---|---|
| Glidepath | Cumulative sell-through targets by date, on a boxed season |
| Cover corridor | A minimum and a maximum of weeks of cover, on a rolling commitment |
| Wave | Two points, build-to and sell-down-to, on a boxed commitment |
| Level | On This week, before a pace week is scored: within 2% of last year's same weeks either way |
The refusals Declare prints when a shape does not fit its window:
A boxed window declares its pace as a glidepath (a season) or a wave (build-to + sell-down-to), not a cover corridor.
Glidepath dates must be strictly ascending.
Glidepath targets are cumulative sell-through and may never decrease.
Glidepath points must lie inside the Commitment window.
What you can do about it
The shape is chosen when the window type is chosen, on Declare's first step; Amend can move the points or the corridor as a new version, never the window type, and the Amend page will not re-pace a commitment that paces to a wave. A glidepath off its target sends the room's next action to trading in season and to the buy before it. A corridor's minimum is a floor: a book under the corridor is short, and the next action on a rolling commitment opens replenishment, where the short lines are bought.
Glossary line
A pace shape is the form a sell-through pace follows: a glidepath of dated targets on a boxed season, a corridor of weeks of cover on a rolling commitment, or a wave of two points, a climb and a descent, on a boxed commitment.