This chapter provides a foundation for deeper understanding of the nature of rehabilitation counseling practice. Job analysis, role and function, professional competency, critical incident, and knowledge validation research are all terms that describe a process whereby the professional practice of rehabilitation counseling has been systematically studied. Rehabilitation counseling has been described as a process in which the counselor works collaboratively with the client to understand existing problems, barriers and potentials in order to facilitate the effective use of personal and environmental resources for career, personal, social, and community adjustment following disability. A majority of rehabilitation counselors (RCs) still practice in the public, private, and not-for-profit rehabilitation sectors. However, more recently RCs have begun to practice in independent living centers, employee assistance programs, hospitals, clinics, mental health organizations, public school transition programs, and employer-based disability prevention and management programs.