<p>Publish and compare. The moment a revision lands, the comparison shows what moved, element by element, grouped by structural, MEP, envelope and interior.</p> <ul><li>Publish the new model from Revit or Navisworks.</li><li>Select the previous revision to compare against.</li><li>Read the list of added, removed and modified elements.</li><li>Pin an issue to any element that touches another trade&#39;s work.</li></ul> <p>The next step is making sure people hear about it. Each owner gets a daily 6am digest of the issues assigned to them, so the change reaches them without a call or a forwarded email.</p> <p>The comparison takes about 15 minutes instead of a 90-minute meeting.</p> <p>The reason to do it right away is cost. A clash caught in the model costs about $50. Found in the field, it costs $5,000 to $50,000. Every day a change sits unflagged is a day somebody may build on top of it.</p>