Each month's submission checked against last month's and the accepted programme: progress achieved against what was forecast, whether the statusing holds together, every change made, the movement of the dates and the schedule checks, collected into a register of comments with a recommendation.
What it gives you
Progress integrity: actuals changed after they were reported, status going backwards, progress back-dated, remaining duration growing.
Every comment numbered, most severe first, with what was found, example activities and the action asked of the contractor.
A contractor library keeps each contractor's submissions month by month and reviews each one as it arrives.
A recommendation, with its reasons
Any high finding gives Return for revision; medium findings give Accept with comments; otherwise Accept. The comments export to Excel with columns for the contractor's response and status.
Check your next update before anyone else does.
Free for a day. Export an XER from P6 and see what it says.