Originally termed ‘Industrial-Organizational Psychology (I/O)’, practitioners of this specialty emanate from varying backgrounds in business-psychology related fields, and contemporary I/O professional practice can best be thought of as a hybrid across multiple traditions. Specialists in this area can be educated and trained (and practice) in related, but somewhat differing, traditions. Those interested in this specialty area within psychology will find this online resource invaluable as the most current description of the competencies thought important to help define the OBC psychologist.