What is the experimentalist challenge to the method of cases?

Abstract This paper puts forward a new formulation of the experimentalist challenge to the method of cases. Unlike previous attempts to articulate the challenge, the one proposed is based on a clear characterization of the targeted philosophical methodology. The method of cases is explicated as a form of thought experimentation aimed at testing philosophical hypotheses with a distinctive modal force. Given this explication, the empirical evidence gathered by experimental philosophers concerning the instability of case judgments is shown to constitute a stumbling block for the validation of the method as a rational form of hypothesis testing. The experimental challenge is presented as the challenge to compellingly indicate how this stumbling block can be removed, and the method of cases validated as a form of thought experimentation suitable for rationally testing philosophical hypotheses. The challenge, as presented in the text, is shown to be free from all the main criticisms leveled at previous versions of it and as one not yet met.