The White-Collar Crime chapter states that understanding detection methods is critical for both investigating fraud schemes and designing effective prevention strategies. The manual reports that the leading detection methods are tips, internal audit, and management review, and it further emphasizes that tips are by far the most common means of detection. In the cited ACFE data, tips accounted for 40% of cases, exceeding internal audit and management review combined. The manual also notes that this pattern has been consistent across multiple editions of the ACFE study. Because the question asks for the single most common method, the answer is tips. This finding is one reason the manual strongly supports hotlines and other reporting mechanisms as key anti-fraud measures within organizations.