Batch scheduling with controllable setup and processing times to minimize total completion time

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


We study a problem of scheduling n jobs on a single machine in batches. A batch is a set of jobs processed contiguously and completed together when the processing of all jobs in the batch is finished. Processing of a batch requires a machine setup time dependent on the position of this batch in the sequence. Setup times and job processing times are continuously controllable, that is, they are real-valued variables within their lower and upper bounds. A deviation of a setup time or job processing time from its upper bound is called a compression. The problem is to find a job sequence, its partition into batches, and the values for setup times and job processing times such that (a) total job completion time is minimized, subject to an upper bound on total weighted setup time and job processing time compression, or (b) a linear combination of total job completion time, total setup time compression, and total job processing time compression is minimized. Properties of optimal solutions are established. If the lower and upper bounds on job processing times can be similarly ordered or the job sequence is fixed, then O(n3log n) and O(n5) time algorithms are developed to solve cases (a) and (b), respectively. If all job processing times are fixed or all setup times are fixed, then more efficient algorithms can be devised to solve the problems.
Original languageEnglish
Pages (from-to)499-506
Number of pages8
JournalJournal of the Operational Research Society
Issue number5
Publication statusPublished - 1 May 2003


  • Batching
  • Controllable setup and processing times
  • Minimizing total completion time
  • Scheduling
  • Single machine

ASJC Scopus subject areas

  • Management Information Systems
  • Strategy and Management
  • Management Science and Operations Research
  • Marketing


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