出声思维法（TAP）是一种收集数据的方法，用于产品设计与开发、心理学和一系列的社会科学（如阅读、写作和翻译和翻译过程的研究）中的可用性测试（usability testing）。出声思维法是由IBM的克莱顿刘易斯研发。

出声思维法要求被试在完成指定任务时进行出声思维。要求用户在完成任务时所有的思想、行动和感觉。这使得观察者亲身体验完成任务的过程（而不仅仅是最终产品）。要求测试中的观察者客观记录用户所说的每一句话，不要试图解释其行动和言辞。测试往往以录音和录像进行，使开发人员可以回顾。这样方法的目的是明确执行特定任务者隐含的是什幺。

Think-aloud protocol (or thinking aloud; also talk-aloud protocol) is a protocol used to gather data in usability testing in product design and development, in psychology and a range of social sciences (e.g., reading, writing, translation research, decision making, and process tracing). The think-aloud method was introduced in the usability field by Clayton Lewis while he was at IBM, and is explained in Task-Centered User Interface Design: A Practical Introduction by C. Lewis and J. Rieman. The method was developed based on the techniques of protocol analysis by Ericsson and Simon. However, there are some significant differences between the way Ericsson and Simon propose that protocols be conducted and how they are actually conducted by usability practitioners, as noted by Boren and Ramey. These differences arise from the specific needs and context of usability testing; practitioners should be aware of these differences and adjust their method to meet their needs while still collecting valid data. For example, they may need to prompt for additional information more often than Ericsson and Simon would allow, but should take care not to influence what participants say and do.