In a project, total float measures the:

In accordance with the PMBOK® Guide (Project Schedule Management), Total Float (also known as " slack " ) is a critical component of the Critical Path Method (CPM). It represents the amount of time that a schedule activity can be delayed or extended from its early start date without delaying the project finish date or violating a schedule constraint.

Calculation: Total float is calculated by subtracting the Early Start (ES) from the Late Start (LS), or the Early Finish (EF) from the Late Finish (LF).

$Total\ Float = LS - ES$ or $LF - EF$

Critical Path: Activities on the critical path typically have a total float of zero. This means any delay to a critical path activity will result in a day-for-day delay of the entire project completion date.

Flexibility: Positive total float indicates that there is " cushion " or flexibility in the schedule for those specific activities. Negative float can occur when a constraint (such as a fixed deadline) is violated.

Analysis of Distractors:

A. Ability to shuffle schedule activities: This refers more generally to schedule optimization or resource leveling techniques, not the specific mathematical definition of float.

C. Cost expended to restore order: This is unrelated to float; " crashing " is a schedule compression technique that involves adding resources to shorten the duration, which usually increases cost.

D. Estimate of the total resources: The " forward pass " is used to determine the Early Start and Early Finish dates of activities. While it is part of the calculation for float, it does not estimate the " total resources " required for the project.