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Priority rule search technique for resource constrained project scheduling

  • US 5,671,361 A
  • Filed: 09/28/1995
  • Issued: 09/23/1997
  • Est. Priority Date: 09/28/1995
  • Status: Expired due to Term
First Claim
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1. A method of scheduling job tasks and activities of construction, manufacturing, research, and development projects to minimize overall duration time of the projects, comprising the steps of:

  • (a) identifying all job tasks of a project to be scheduled, wherein the project is chosen from at least one of;

    a construction project, manufacturing project, research project and development project;

    (b) identifying all resources available for the project to be scheduled;

    (c) identifying time values for completing each task for the project to be scheduled;

    (d) computing a priority index value for each job task in accordance with the equation;

    
    
    space="preserve" listing-type="equation">PRST=w x(ACTIM)+(1-x)(MACTRES)!+ 1-w! y(MGRD)+(1-y)(LFT)!where;

    w is a variable incremented between 0 and 1,x is a variable incremented between 0 and 1,ACTIM is critical path time minus late start time for each task,MACTRES is the task duration multiplied by the sum of the scaled resource requirements for the task, plus addition of maximum MACTRES value following the task,MGRD is sum of scaled resource requirements for the activity multiplied by resource type complexity factor of the task,LFT is the latest finish time to complete the task; and

    (e) providing a schedule of job tasks based on the priority index values for each task, wherein the all job tasks for the project are in one schedule which minimizes the duration time to complete the project.

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