(a) Within the Position Classification System, positions shall be classified in one of the three subsystems provided in subsections (b), (c), and (d) of this section.
(b) There shall be a Craft and Labor Position Classification Subsystem (hereafter called the Craft and Labor System) which shall cover all positions in recognized trades or crafts, or other skilled mechanical crafts, or in unskilled, or skilled manual labor occupations, and other employees including foreman and supervisors in positions having trade, craft, or laboring experience and knowledge as the paramount requirement. The Craft and Labor System is divided into 17 grades, from 1 to 17, of increasing responsibility and difficulty.
(c) There shall be an Education Position Classification Subsystem (hereafter called the Education System) which shall cover nonsupervisory, supervisory, and administrative positions in the professional education, guidance, and library services of the Department of Education, but not including top management positions. The Education System is divided into the grades and additional pay categories shown in section 494 of this chapter.
(d) There shall be a General Position Classification Subsystem (hereafter called the General System) which shall cover all positions to which this subchapter is applicable which do not come under subsections (b) and (c) of this section. The General System is divided into 27 grades, from 6 to 32, of increasing responsibility and difficulty.