“…The development of tools such as the competency in cognitive analytic therapy measure or CCAT (Bennett & Parry, 2004), which provide a systematic means of evaluating whether core CAT competencies are present in therapy, has therefore been an important development. Within this special issue, the paper by Parry, Bennett, Roth, and Kellett (2020) on developing a framework of key CAT competencies signifies a further step in establishing the clinical skills and activities that are essential to CAT, providing a way it can be evaluated consistently alongside retaining its flexibility. It may also be helpful to consider developments in trial methodology and analysis, especially approaches for modelling heterogeneity in treatment processes and investigating mechanisms of change (Dunn & Bentall, 2007; Stice, Rohde, Seeley, & Gau, 2010).…”