“…The first direction is the scheduling of the production operations in time scale [1,22,27,38,39], and that is the most frequently addressed issue in practice. The second area is focused on the improvement of the production process at the level of the performing of operations [3,16,17,21,32]. To the third area belong some special principles to improve the efficiency of the production process [4, 6÷8, 12÷14, 18÷20, 23÷30, 40÷42].…”