Part
Part divides a plan’s sections into numbered acts.
Each marker renders as a borderless, surface-tinted band carrying an accent PART N tag and the act title, and every section after it belongs to that act.
Big Plan derives slide numbers, sidebar navigation grouping, and TableOfContents group headers from the dividers, so the deck structure is authored exactly once.
How it looks
Section titled “How it looks”
When to use it
Section titled “When to use it”Group a plan of roughly five or more sections into about three acts, canonically Context, The proposal, and Shipping & your review. A short plan whose sections already read in one breath does not need dividers.
When not to use it
Section titled “When not to use it”Do not add parts to a short plan whose handful of sections a reader would step over, and never write the act number into the title — Big Plan numbers parts itself.
Compared with
Section titled “Compared with”Slide— reach for it to type one section.Partgroups the sections after it into an act.
Authoring
Section titled “Authoring”<Part title="Context" />
<Slide type="status-quo" />
## Inline retries delay checkout
...
## Success looks like
...
<Part title="The proposal" />
## The retry queue
...The contract
Section titled “The contract”titleis required and non-empty; it names the act, never its number.Partis self-closing and rejects body content.- Numbers are assigned in document order at render time; a title containing its own number would read “Part 1: 1. Context”.
Each violation fails validate and render with a positional diagnostic.
Run big-plan guidance Part for judgment-level usage guidance.