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  1. Job. These have to be sequenced, hence there should be a particular number of jobs (groups of tasks to be performed) say n to be processed.
  2. Machine. Jobs have to be performed or processed on machines. It is a facility which has some processing capability.
  3. Loading. Assigning of jobs to facilities and committing of facilities to jobs without specifying time and sequence.
  4. Scheduling. When the time and sequence of performing the job is specified it is called schedule
  5. Sequencing. Sequencing of operations refers to a systematic procedure of determining the or which a series of jobs will be processed in a definite number, say k, facilities or machines.
  6. Processing Time. Every operation that is required to be performed requires definite amount of time at each facility or machine when processing time is definite and certain, scheduling is easier as compared to the situation in which it is not known.
  7. Total Elapsed Time. It is the time that lapses between the starting of first job and the completion of the last one.
  8. Idle Time. The time for which the facilities or machine are not utilized during the total elapsed time.
  9. Technological Order. It is the order which must be followed for completing a job. The requirement of the job dictates in which order various operations have to be performed, for example, painting cannot be done before welding.

10. Passing not allowed. If ‘n’ jobs have to be processed through ‘m’ machines in 3 particular order of M1, M2, M3 then each job will go to machine M1 first and then to M2 and finally to M3. This order cannot be passed.

11. Static arrival pattern. If all the jobs to be done are received at the facilities simultaneously.

12. Dynamic arrival pattern. Here the jobs keep arriving continuously.