Think-aloud Protocols (TAPs) have been used extensively in process-oriented Translation Studies (TS). The serious questions regarding the experimental validity of this research methodology when applied to translation have nonetheless often remained unspoken. This paper surveys the breakthroughs as well as the limits of the growing body of literature dealing with TAPs in TS, points at the necessity of taking issues of experimental, theoretical and environmental validity more seriously, and offers suggestions for improvements. The claim is that the risks involved in the adoption of a lax experimental methodology in TAP studies, often underestimated in the past, may invalidate not only the results obtained in the single projects, but, crucially, the method as a whole.