CON: A constant time allowance for manufacturing all jobs; that is, the same lead time is added to all jobs at receipt date to calculate the due date.
SLK: A time allowance that provides an equal (constant) waiting time or slack for all job; that is, the due date is set equal to the receipt date plus the sum of all processing times, plus a fixed additional slack time.
TWK: A time for waiting that has slack proportional to a job's total work content; that is, lead time to be added to receipt date is a multiple of the sum of all processing times.
[Thomas E. Vollmann, William L. Berry, D. Clay Whybark, F. Robert Jacobs - Manufacturing Planning and Control for Supply Chain Management Pages: 545-546]
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