A schedule's late dates are calculated during the:

The backward pass is a technique used in project scheduling to calculate the latest possible start and

finish dates for each activity without delaying the project. It starts from the project's end date and

works backward through the network diagram. This calculation helps identify the critical path and

determine the amount of float (slack) available for non-critical activities.

Option A: Loop calculations refer to iterative processes within network diagrams but do not

specifically relate to late date calculations.

Option C: Forward pass calculates the earliest possible start and finish dates for activities.

Option D: Float is the amount of time that a task can be delayed without affecting the project's end

date, not a calculation method.

Therefore, B. Backward pass is the correct answer as it is used to determine a schedule’s late dates.