<p>You catch scope drift by comparing the model itself, so every design change shows up in the record instead of surfacing as rework. Most teams miss drift because tracking lives in separate emails and spreadsheets, days after the design moved on.</p> <p>BidLight runs inside Revit and Navisworks. Here is how it works:</p> <ul><li>Publish after every meaningful change. Each publish is a versioned snapshot.</li><li>Compare it with the previous revision. Differences appear element by element, grouped by structural, MEP, envelope and interior.</li><li>Pin an issue to each element that drifted. It carries the sheet and revision it came from.</li><li>Assign owners. They see their items in the 6am digest.</li><li>Watch the project view for who is behind while there is still schedule to recover.</li></ul> <p>Drift caught in the model costs about $50 to fix. Left until the field finds it, the same problem costs $5,000 to $50,000.</p>