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I agree with Zulfiqar Ali. He provided sound information
Typically, you level during the forward pass through a project. This determines the earliest dates to schedule an activity when sufficient resources will be available to perform the task. If forward leveling delays the project's early finish date, a backward pass might be necessary to recalculate late dates. P6 begins the forward pass from this activity and determines which successor activity has the most critical Relationship Successor Total Float.
Backward leveling schedules activities to occur as late as possible without delaying the project finish
