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In this paper we report on a controlled experiment withover 170 student subjects to investigate the influence ofinspection process, i.e., the defect detection technique applied,and inspector capability factors on the effectivenessand efficiency of inspections on individual and team level.The inspector capability factors include measures on theinspector's experience, as well as a pre-test with a mini-inspection.We use sampling to quantify the gain of defectsdetected from selecting the best inspectors according to thepre-test results compared to the performance of an averageteam of inspectors.Main findings are that inspector development and qualityassurance capability and experience factors do not significantlydistinguish inspector groups with different inspectionperformance. On the other hand the mini-inspectionpre-test has considerable correlation to laterinspection performance. The sampling of teams shows thatselecting inspectors according to the mini-inspection pretestconsiderably improves average inspection effectivenessby up to one third.