Nice response Thomas. I suspect that you are using different calendars. One additional input is that if two tasks are linked with a finish/start relationship, it will not be the cause of the discrepancy. Using Thomas’s example, if the predecessor task ends one hour into Friday, the successor task won’t start until one hour into the day and the resource will not be fully allocated. If it is happening all over the project then high probability that it is due to calendar inconsistencies (project, task, and/or resource).