Capturing Fingerprint Expertise With Protocol Analysis

Abstract

In this study, we used think-aloud protocols to compare how 44 fingerprint examiners and 44 novices analysed prints. Through this qualitative approach, we discovered several notable differences. Experts focused on local ridge characteristics and minute details of each print, while novices concentrated more on global features. Additionally, experts demonstrated adaptability in dynamically planning their systematic approach and integrated specialised knowledge of causal factors affecting prints. In contrast, the novices relied more on general intuition. Furthermore, experts consistently displayed critical thinking and metacognition, carefully weighing the reliability of each identifying feature before making conclusions. However, there was variation in the precise evaluation approaches and conclusion thresholds among experts. Overall, these findings reveal the substantial complexity, adaptability and domain knowledge enhancing expert performance in fingerprint analysis. We discuss implications including balancing training of intuitive and analytical reasoning, implementing more detailed documentation, incorporating falsification practices and driving statistical advancements to strengthen evidence evaluation.