Resource Levelling Problem

Using resource levelling I created my first draft. I decided an activity could start earlier. So I removed its link and created a new link to an activity that finished earlier. Scheduling has this activity starting earlier. A Resource levelling has this activity now starting later than the first draft and the end date is now longer. If I return the constraints to the first draft then the project finishes earlier.

Surely resource leveling should workout the earliest finish of the project without breaking any of the constraints. Any suggestions?


I am resourcing levelling in days with an order of TF and using P5.