What is the difference between prevention and inspection in quality?

Prevention focuses on keeping errors out of the process by designing quality into the product and process from the beginning, such as training, checklists, templates, and process standardization. Inspection focuses on keeping errors out of the deliverable by examining and measuring outputs to determine whether they conform to requirements. Philip Crosby's principle states that the cost of prevention is always less than the cost of inspection and correction. PMI advocates a prevention-over-inspection approach because it is more cost-effective to prevent defects than to find and fix them. ---