74 Managing projects as investments: Earned value to business value
aswith the DIPP, stumbled across a new project management concept.
And so I named it critical path drag,
2
drag being the force that slows down
an object traveling through air or water.
Over the years, I have taught the concept in numerous graduate
classes and PMI-approved seminars and webinars, published a book
and numerous articles on the subject, and used it to help clients com-
press and recover schedules. There are now three software packages
that compute critical path drag. I don’t think there can be any doubt
but that identifying how much time activities are adding to the proj-
ect duration is a vital metric. And yet most of the project management
world remains blis