The project was designed to avoid influencing the treatment process, keeping the therapist and the patient unaware until the end of treatment that the case was included in the project. Among the problems discussed are those related to the size of the sample (forty-two patients), the distribution of the sample (half analytic, half other psychotherapeutic cases), the influence of the specific hospital and clinic setting, the variation in therapists' skills, the necessity for different investigators for initial and termination studies, and the necessity for some contamination in the predictive process.