Simple Rules
FIFO (first in first out) PNj = taj
SPT (shortest processing time) PNj = oj
ODD (earliest operation due dates) PNj = tdj
EDD (earliest job due date) PNj = tdj *
SL (slack) PNj = tdj* - t - wj* * = tsj *
CR (critical ratio) PNj = (tdj - t) / (tdj - tdj - oj)
SL/OPN (slack per remaining operation) PNj = tsj / nj*
SL/RPT (slack/remaining processing time) PNj = tsj / wj*