All effective trainers have certain skills and qualities in common. The core competencies of good trainers are skills that allow trainers who possess those competencies to increase their effectiveness in organizations as well as sustain the overall training profession. This Infoline presents a set of core competencies for trainers based on the ASTD Competency Model's foundational competencies that fall into the categories of business and management, interpersonal, and personal. For the trainer who continually works to improve his or her skills, this issue will enable him or her to develop and demonstrate these competencies on the job, assess competencies that may need to be developed further, and chart a path for future growth.