When trying to find an optimal schedule, we need to compute the completion time of each process step for each unit that must be processed. for units that are not scheduled first, what are the 3 components of the completion time you must add together?

FCFS - First Come First Serve.

Shortest Processing Time.

Critical Ratio.

Explanation:

FCFS - First Come First Serve is the simplest scheduling algorithm that schedules according to arrival times of processes.

Shortest Processing Time: This actually  goes ahead to process the job with the shortest waiting time ahead of all other jobs waiting in the queue.

Critical Ratio: This is calculated by dividing the time remaining for a job's due date by the total actual time remaining for the job.