The methodological technique of theoretical saturation, commonly used in qualitative researches, particularly about clinic activities, dialogues and can benefit from theory and practice of psychoanalysis. Although some imprecision in the final sample size is inevitable and inherent to qualitative methods, it should not lead to techniques and procedures that can weaken or jeopardize the validity and credibility of both empirical analysis and findings. This essay discusses aspects of cognitive and affective dimensions present during data collection through interviews, in both informants and researchers. For this, the Freudian concepts of transference and countertransference are used, and also the notions of rêverie and beta elements, formulated by Wilfred Bion. It is postulated that these kind of phenomena help determine how much data coming from the sample elements are sufficient, necessary and possible to enhance the theoretical depth of the studied object.
Qualitative research; data collection; psychoanalysis