Consider two separate activities, both with the same duration, and both bearing the same Total  Float.  Are these two activities equivalent  in terms of the amount of influence they either exude on downstream activities  or feel from upstream activities?

Concept of Flow Rates

The answer depends on how the activities related to the activities before and after them.  And we’re not just talking about immediately before or after! Here is what we  consider under Flow Rate Measurement:

As to What Precedes

  • The number of activities immediately-preceding the Subject Activity.
  • The nature of the logic ties linking to the immediately-preceding activities.
    • Finish-to-Start logic ties:
      • Will impact the entire length of the Subject  Activity.
      • Require the prior performance of the entire  length of the Restricting Activity.
    • Start-to-Start logic ties:
      • Same as the Finish-to-Start, it will impact the  entire length of the Subject Activity.
      • Unlike the Finish-to-Start, it will only require  prior performance of a small (initial) portion of the Restricting Activity.
    • Finish-to-Finish logic ties:
      • Unlike the other two relationship types, it will  only impact a small (final) portion of the Restricted Activity.
      • Same as the Finish-to-Start,  it will require the prior performance of the  entire length of the Restricting Activity
  • Collectively, the number of logic ties coming  into a Subject Activity, regardless of from how many activities.
  • Beyond the immediately-restricting activities,  the numerous of activities that precede the Subject Activity, all the way back  to the start of each path on which the activity resides.

As to what Succeeds

The same as above, just reversed.

Flow Rate Computations

Based on the above  variables, Flow Rate computations reflect the amount of delay pressure being  “felt” by each individual activity. Pressure is measured by arithmetic formulas  that factor Discrete Activity Float, Activity Resiliency, Activity  Vulnerability, and other variables.   Pressure measurements are taken at each as activity “hook point.”  These hook points are treated as Flow Gates,  and the amount of pressure against each separate Flow Gate are aggregated to  derive a Delay Vulnerability  value per  activity … and then, per Activity Path Segment, Activity Path, and MCP.