PV = PV1(Critical Activities) + PV2(Non Critical Activities) And CV will not show that there is a problem for too long!Ĭorrect me if i am wrong I hope the following two cases will clarify the issue: You may have excellent positive CV for some time but your project finish will be delayed. Expensive resource works faster than expected, cheap one - slower. Your project consists of two parallel activities of the same duration executed by two different resources, one is expensive and another cheap. I think that being behind schedule means that some target dates may be violated and not that you spend less money than expected delaying activities that have sufficient float. If you are successful with the critical activities (ahead of schedule) and for some reason postponed an activity that has large float it does not mean that you are behind schedule though your CV may be negative.
If this non-critical activity was expensive then your CV will be positive. If we are late with the critical activities and the prognosed project finish is late you are certainly behind schedule even if you have done some non-critical activity faster than was expected. First of all no project will be on schedule - you are not able to do all activities just in time because there is always some uncertainty.