Hi, all.
If anyone is interested, Defense AT&L Magazine just my published my article "The Drag Efficient". To find it, scroll down and click the link at:
http://www.dau.mil/pubscats/Pages/DefenseAtl.aspx [1]
Critical path drag is a metric that tells the scheduler how much time an activity (or lag or constraint) is delaying the end of the project. It is computed by Spider Project and by the Sumatra Project Optimizer add-on to MS Project.
Fraternally in project management,
Steve the Bajan