Supervisory aptitude is the demonstration of aptitude or potential for the performance of supervisory duties through successful completion of regular or special assignments which involve some supervisory responsibilities or aspects of supervision, e.g., by serving as a group or team leader; or in similar work in which opportunities for demonstrating supervisory capabilities exist; or by the completion of training courses in supervision accompanied by application of supervisory skills in work assignments; and/or by favorable appraisals by a supervisor in indicating the possession of supervisory potential. Positions in this series require the application of some of the principles, methods and techniques in a specific or limited area of engineering, and a practical knowledge of the construction, application, properties, operation and limitations of engineering systems, processes, structures, machinery, devices or material, and as required, related manual, craft, instrument operation, mathematical, graphic or management skills and abilities.