Lecture Principle of inventory and material management - Lecture 14

Lecture 14 - Production Activity Control (Continued). The contents of this chapter include all of the following: Sequencing, slack, johnson''s rule, monitoring, advance planning and scheduling, TOC, scheduling procedure, employee scheduling.

Lecture 14 Production Activity Control (Continued) Books • Introduction to Materials Management, Sixth Edition, J. R. Tony Arnold, P.E., CFPIM, CIRM, Fleming  College, Emeritus, Stephen N. Chapman, Ph.D., CFPIM, North Carolina State University, Lloyd M.  Clive, P.E., CFPIM, Fleming College • Operations Management for Competitive Advantage, 11th Edition, by Chase, Jacobs, and Aquilano, 2005,  N.Y.: McGraw­Hill/Irwin • Operations Management, 11/E, Jay Heizer, Texas Lutheran University, Barry Render, Graduate School of  Business, Rollins College, Prentice Hall Objectives • • • • • • • • Sequencing Slack Johnson's Rule Monitoring  Advance planning and scheduling TOC Scheduling procedure Employee Scheduling Sequencing • • • Prioritize jobs assigned to a resource If no order specified use first­come first­served (FCFS) Other Sequencing Rules – – – – – – – – – FCFS ­ first­come, first­served LCFS ­ last come, first served DDATE ­ earliest due date CUSTPR ­ highest customer priority SETUP ­ similar required setups SLACK ­ smallest slack CR ­ smallest critical ratio SPT ­ shortest processing time LPT ­ longest processing time  Minimum Slack & Smallest Critical Ratio • SLACK considers both work and time remaining SLACK = (due date – today’s date) – (processing time) • CR recalculates sequence as processing continues and  arranges information in ratio form time remaining CR =                       = work remaining due date ­ today’s date remaining processing time If CR > 1, job ahead of schedule If CR