<p>You keep it on budget by catching each change in the model before it reaches the field, so a design change never turns into a surprise rework. More jobs go over because of changes nobody flagged than because of one big mistake.</p> <p>BidLight runs inside Revit and Navisworks. You publish from the model, and when the design changes the new revision is compared with the old one.</p> <ul><li>Work from the current snapshot. Every publish is versioned with its own author and milestone.</li><li>Compare revisions element by element, by category, so you see what moved in about 15 minutes.</li><li>Pin issues to the elements and assign owners. The 6am digest keeps them moving.</li><li>Close issues only with a screenshot, a tagged user and the model commit.</li><li>Watch the project view for who is behind while there is still schedule to recover.</li></ul> <p>Cost control here means avoiding rework, idle crews and change orders. A clash caught in the model costs about $50. Found in the field it costs $5,000 to $50,000.</p>