<p>BidLight catches it by saving every publish as a versioned snapshot and comparing revisions element by element, so a 4-inch duct move shows up the next time anyone publishes. You see who moved it and when, without comparing PDFs or sitting through a long meeting.</p> <p>Here is how it works:</p> <ul><li>Publish your model from Revit or Navisworks.</li><li>Compare the new revision with the last one, grouped by structural, MEP, envelope and interior.</li><li>Check the 6am digest for issues assigned to you.</li><li>Pin an issue to the duct and assign the fix.</li></ul> <p>A clash caught in the model costs about $50. Left until the field, it costs $5,000 to $50,000 in rework and idle labor.</p> <p>Closing an issue in BidLight needs proof, including the linked model commit, so a fix is real before anyone signs off. You avoid the surprise rework and keep the schedule intact.</p>