Understanding psychotherapists’ interventions during sessions is a key issue in the field of psychotherapy research. This methodological article aims to compare and synthesize three discourse analysis frameworks in order to develop a new instrument. One thousand sixty-five verbal interventions drawn from eight interviews (Brief Psychodynamic Investigation) conducted with two patients were coded using the frameworks of Blanchet (1991), Porter (1950), and the Psychotherapy Intervention Rating Scale (1999). Frequency analysis of the 25 intervention categories using cross-tabulations identified categories common to and specific to the three frameworks, enabling the construction of a synthetic instrument comprising 15 categories. This study demonstrates that integrating instruments derived from different theoretical frameworks is both feasible and fruitful.[author’s abstract]