building construction and design practices, methods and materials; modern architectural and structural engineering concepts, methods and procedures as applied to the design and construction of residential, commercial, industrial and high-rise buildings; principles of structural design and engineering mathematics; principles of lead supervision and training; pertinent federal, state and local codes, laws and regulations including building codes; office procedures, methods, and equipment including computers and applicable software applications such as word processing, spreadsheets, and databases; principles and applications of customer service. Employees perform the most difficult and responsible types of duties assigned to classes within this series including advanced plan checking of industrial, commercial and high-rise building plans for structural soundness and conformity with building codes, safety ordinances and related regulations.