Counselor development is a topic of great interest to both trainers and counselors-in-training. Several models of counselor development as presented in the literature are described. Recent research has investigated developmental factors relating to counselor identity and sense of self-efficacy from a trainee perspective. A model of five recurring themes pertaining to counselor development is proposed: Shattering Experiences, Losing (Old) Sense of Self, Transition, New Sense of Self, and Counselor Identity. Few differences exist between career counselors and personal counselors. Implications for training and practice are discussed. (Contains 16 references.) (GCP)