So now product is live right? So take the defect leakage ratio. Number of defects in post production/client or stake holders found vs defects found by qa team. Therr you can analyse how mymuch you missed and find the root cause of the same. Have a pareto chart for the same. Find 80:20 principle. Then work on those 80% issues and get corrective measures.

So now product is live right? So take the defect leakage ratio. Number of defects in post production/client or stake holders found vs defects found by qa team. There you can analyse how much you missed and find the root cause of the same. Have a pareto chart for the same. Find 80:20 principle. Then work on those 80% issues and get corrective measures.