In addition, many require a period of supervised practice. The SIOP website provides a good general description of them licensing requirement, as well as contact information for each state’s licensing body, It is clear that licensing is necessary to protect the public from untrained or poorly prepared therapists in clinical and counseling psychology, It is not so clear in the area of I-O, since I-O psychology are not really health care providers in the same way. I-O psychologists are almost always retained by organizations rather than by single individuals, and most organizations have professional within their tanks who can (or should be able to) distinguish between the trained and untrained I-O psychologists. Individual members of the public considering using the service of a therapist are less able to make such distinctions.