Note: – This question is to check do you really know practically which phase is the most defect prone.
Design phase is the more error prone than the execution phase. One of the most frequent defects which occur during design is that, it does not cover the complete requirements of the customer. Second wrong or bad architecture and technical decision makes the next phase that is execution more prone to defects. Because the design phase drives the execution phase it’s the most critical phase to test. The testing of the design phase can be done by good review. On an average 60% defect occur during design and 40% during execution phase.
Phase wise defect percentage