<p>A missed model change leaks margin because every trade that buys out against the old revision is working from the wrong drawing before the first subcontract is signed.</p> <p>BidLight keeps the record tied to the model. You publish from Revit or Navisworks and each publish is a versioned snapshot. Any two revisions compare element by element, so you see what changed and who published it. No side-by-side PDF comparison.</p> <p>How to catch the leak:</p> <ul><li>Stop working from last week&#39;s export.</li><li>Publish from the live model, not a copied file.</li><li>Compare revisions element by element to see what changed since the trade last looked.</li><li>Pin issues to the affected elements and assign owners.</li><li>Check the 6am digest to see who has not acted.</li></ul> <p>A conflict caught in the model costs about $50. After a trade has bought out and installed against the old revision, the same one costs $5,000 to $50,000.</p> <p>Plans run from Basics at $260 per license per year to Max at $590.</p>