<p>Every export BidLight publishes is versioned and diffed element by element, so an old revision can&#39;t hide from you. The model is the record, and cost rides on the same model.</p> <p>Here&#39;s how you catch it before the bid goes out:</p> <ol><li>Publish straight from Revit or from the federated Navisworks model. No side files floating around.</li><li>Open the version history and compare your current estimate against the latest export.</li><li>Read the element-level diff. It shows what moved, what was added, what was removed, and when.</li><li>Check the daily 6am digest. It tells you what your team changed and what you own, every morning.</li><li>Re-price from the current model, so labor, equipment, material and time costs update on the live record instead of a stale PDF.</li></ol> <p>The win: you stop comparing exports by hand the way it was done in 2005, and you stop finding the slip three weeks late at the GC meeting. You walk into the bid with numbers you can defend.</p>