<p>Because every export version is kept and diffed element by element. You can show what actually changed in the model, not just trust someone&#39;s status field.</p> <p>Here&#39;s how you prove it:</p> <ol><li>Export the model from Revit or the federated model from Navisworks. That export is versioned automatically.</li><li>When the next changes land, export again. BidLight diffs the two versions element by element.</li><li>See the specific element that moved, got added, or got resolved. Not a PDF flip. Actual geometry.</li><li>Check the issue history against that diff so you know who owned it and when it changed.</li><li>Each morning the digest shows what you own and what moved, so nobody has to reconstruct the week.</li></ol> <p>That record is what you bring to the coordination meeting. No side-by-side PDFs from 2005. No two hours asking who moved a duct. You open the version, point at the diff, and it&#39;s answered.</p> <p>Marked closed is a claim. A diff is evidence. That&#39;s the difference between losing three weeks to a slip and catching it while it&#39;s still cheap.</p>