The cases of 40 consecutive patients, accepted for supervised psychoanalysis at the Treatment Center of The New York Psychoanalytic Institute, are reviewed. The process of the initial evaluation is examined as well as the nature of the patient group, the characteristics of the treatment, outcome, and follow-up data. A survey of a group of 42 patients from the private practice of a group of graduate analysts during the same period of time is also reported. Both studies are discussed in relation to methodological issues, and an approach is suggested for the study of assessment of analyzability and analyses through a systematic prospective study of analytic treatments conducted by experienced analysts.