Lecture 14 - Production Activity Control (Continued). The contents of this chapter include all of the following: Sequencing, slack, johnsons 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, ., CFPIM, CIRM, Fleming College, Emeritus, Stephen N. Chapman, ., CFPIM, North Carolina State University, Lloyd M. Clive, ., CFPIM, Fleming College Operations Management for Competitive Advantage, 11th Edition, by Chase, Jacobs, and Aquilano, 2005, .: McGraw-Hill/Irwin. Operations Management, 11/E, Jay Heizer, Texas Lutheran University, Barry Render, Graduate School of Business, Rollins College, Prentice Hall Objectives Sequencing Slack Johnsons Rule Monitoring Advance planning and scheduling TOC Scheduling procedure Employee Scheduling Sequencing Prioritize jobs assigned to a resource If no order specified use first-come first-served (FCFS) Other Sequencing Rules FCFS - first-come, first-served LCFS - last come, first served DDATE - earliest due date CUSTPR - highest customer priority SETUP - similar required setups SLACK - smallest slack CR | Lecture 14 Production Activity Control (Continued) Books Introduction to Materials Management, Sixth Edition, J. R. Tony Arnold, ., CFPIM, CIRM, Fleming College, Emeritus, Stephen N. Chapman, ., CFPIM, North Carolina State University, Lloyd M. Clive, ., CFPIM, Fleming College Operations Management for Competitive Advantage, 11th Edition, by Chase, Jacobs, and Aquilano, 2005, .: McGraw-Hill/Irwin. Operations Management, 11/E, Jay Heizer, Texas Lutheran University, Barry Render, Graduate School of Business, Rollins College, Prentice Hall Objectives Sequencing Slack Johnsons Rule Monitoring Advance planning and scheduling TOC Scheduling procedure Employee Scheduling Sequencing Prioritize jobs assigned to a resource If no order specified use first-come first-served (FCFS) Other Sequencing Rules FCFS - first-come, first-served 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 3 Minimum Slack & Smallest Critical Ratio SLACK considers both work and time remaining CR recalculates sequence as processing continues and arranges information in ratio form CR = = If CR > 1, job ahead of schedule If CR < 1, job behind schedule If CR = 1, job on schedule time remaining due date - today’s date work remaining remaining processing time SLACK = (due date – today’s date) – (processing time) 4 Sequencing Jobs Through One Process Flow time (completion time) Time for a job to flow through system Makespan Time for a group of jobs to be completed Tardiness Difference between a late job’s due date and its completion time 5 Simple Sequencing Rules PROCESSING DUE JOB TIME DATE A 5 10 B 10 15 C 2 5 D 8 12 E 6 8 6 Simple Sequencing Rules: FCFS A 0 5 5 10 0 B 5 10 15 15 0 C 15 2 17 5 12 D 17 8 25 12 13 E 25 6 31 8 23 Total 93 48 Average 93/5 = 48/5 = FCFS START PROCESSING COMPLETION DUE .
