In one sentence
The organized table of contents for a data room, mapping every document to its place in the diligence structure.
The longer version
A good index makes a data room navigable: reviewers find what they need without asking, and gaps are visible at a glance. A room organized around a request list generates its index automatically.
The index is where a request-first room beats a folder-first one: nothing is filed by guess, so nothing is lost.
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