The process of scheduling is considered as one of the more important production
planning processes which faces the management of companies, because of the pressure
of competition processes. The management of companies and firms take automation of
this process to get speed and precisions to take suitable decisions. Various kinds of
scheduling problems have received a lot of attention from researchers in a number of
fields. So far research has primarily been focused on finding a good solution with
respect to makespan and total completion time. Heuristic rules have strong advantages
in that these are easy to understand, easy to apply and require relatively little computer
time. For that the researcher has designed a system aided by computer for operations
scheduling on machines in job shop production system based on new heuristic rules to
help scheduler in solving problem in this field. This system is named "Computer
Aided-Job Shop Scheduling" (CA-JSS). It is construction based on two suggested rules
those are called "Modified Least Work Remaining" and "Modified Most Work
Remaining". We wiII apply it particularly on group of cases. We have been divided
these cases into two stages. In the first stage ten examples taken from scientific
references are used as theoretical cases, in second stage we take practical case from
State Company for Electrical Industry (SCEI). The CA-JSS proved its efficiency and
ability in scheduling the operations. The results appear for this system in some cases
best than (Win QSB) software.