The nature of persons and studying persons present many problems. This paper attempts to place the problems in perspective, not only in terms of the past, but also in terms of the future. Insightful contributions of Freud, Adler, and Jung are presented in brief overview. Some of their antecedents are mentioned. A future perspective ? is alluded to. The final section considers applications to education, for diagnosis without treatment, remediation, correction, training, or education is at best, foolish. (Author)