Predecessors on Incomplete Tasks (not summaries and not zero duration milestones) that have negative lag to their successor.  The Pass threshold is no more than 0% of the predecessors counted in the population.  Note - SSI tools uses the total number of Predecessors in the project for this metric.  Since one task may have one or more predecessors, the total population counted can be often greater than the total number of tasks in the project.

 

This metric identifies the number of logic links with a lead (negative lag) in predecessor relationships for incomplete tasks. The critical path and any subsequent analysis can be adversely affected by using leads. The use of leads distorts the total float in the schedule and may cause resource conflicts. Per the IMS Data Item Description (DID), negative time is not demonstrable and should not be encouraged. Using MS Excel, count the number of “Leads” that are found. Leads should not be used; therefore, the goal for this metric is 0.

 

Leads % = (# of logic links with leads / # of logic links) × 100