Scheduling is Not about Chronology; it’s about Logic! - white paper

Scheduling is Not about Chronology; it’s about Logic! - white paper

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This 13-page White Paper is a far-reaching review and provides a long-term perspective on scheduling and scheduling applications. It requires a paradigm shift.
There are several issues when scheduling projects:

  • A “successor” does not “succeed” in time in an SS or FF dependency.
  • Activity sequences often change.
  • Current schedules are too maintenance hungry.
  • Current scheduling software does not allow dynamic due dates.
  • Current scheduling software does not allow dynamic windows of opportunity.
  • Scheduling software does not allow you to schedule (part of) your schedule backward.
All of these issues can be resolved if we start treating dependencies as cause-and-effect relationships and if we would start to see Earlier-Than dependencies in our scheduling applications. All dependencies we currently have are Later-Than dependencies (FS, SS, FF, SF); the dependent date starts at or later than the independent date. Having this would provide the following benefits:
  • More robust schedules that require less maintenance effort.
  • Dynamic due dates: due dates for secondary paths will be updated automatically.
  • Windows of opportunity: Earlier-Than dependences would allow us to create real windows of opportunity in which the scheduling application can schedule the activities.
  • Backward scheduling would be possible with Earlier-Than dependencies
  • Solid hammock tasks are possible with Earlier-Than dependencies
  • Feed buffers can be scheduled dynamically in a Critical Chain schedule.
Cause-and effect dependencies would also require us to renew some terminology used: “driver” replaces “predecessor”, “driven” replaces “successor”, “dependency duration” replaces lag/lead, and “determine relationships” replaces “sequence activities”.