방법 비교

	사고 구술법 (Think-Aloud Protocol)	회고적 사고 표현
분야	인간-컴퓨터 상호작용	인간-컴퓨터 상호작용
계열	Hypothesis test	Hypothesis test
기원 연도	1980	1980
창시자	K. Anders Ericsson and Herbert A. Simon, adapted to HCI by Clayton Lewis	K. Anders Ericsson, Herbert Simon, adapted by Gary Olson and colleagues
유형	Protocol for capturing user cognition and decision-making during task execution	Post-task verbalization method for reflecting on decision-making
원전	Ericsson, K. A., & Simon, H. A. (1980). Verbal reports as data. Psychological Review, 87(3), 215–251.	Ericsson, K. A., & Simon, H. A. (1980). Verbal reports as data. Psychological Review, 87(3), 215–251.
별칭	Talk-Aloud Protocol, Concurrent Thinking Aloud, TA	Delayed Verbalization, Post-task Thinking Aloud, RTA
관련	4	4
요약	The Think-Aloud Protocol is a usability testing method in which participants verbalize their thoughts while completing tasks on a system. As users navigate an interface, they continuously narrate their observations, interpretations, and reasoning, allowing researchers to understand their mental models, decision-making, and frustration points. Originating from cognitive psychology research by Ericsson and Simon (1980), this method was adapted for HCI by Clayton Lewis and has become one of the most widely used techniques for identifying usability problems and understanding user behavior.	Retrospective Think-Aloud is a variant of the Think-Aloud Protocol in which participants complete a task without verbalization, then immediately review a video or replay of their task performance and narrate their thoughts, reasoning, and reactions. This method captures post-hoc reflection on decision-making and user experience without disrupting task execution. Particularly valuable for exploring user awareness, emotional reactions, and retrospective sense-making, Retrospective Think-Aloud provides the explanatory richness of concurrent thinking aloud without the disruption.