During a facility upgrade project, your team is scheduled to install a backup power sub-panel. The network diagram indicates that this activity has no predecessors other than project start, giving it an Early Start (ES) of the morning of Day 5. The electricians estimate the task will require 4 full, consecutive workdays. Senior management has asked you to confirm the earliest calendar day materials will be freed for the next task. Using a forward-pass calculation that treats Day numbers inclusively (EF = ES + Duration − 1), what Early Finish (EF) date should you report?
Using the inclusive forward-pass formula EF = ES + Duration − 1, substitute ES = Day 5 and Duration = 4: EF = 5 + 4 − 1 = Day 8. The subtraction accounts for counting the start day as Day 5; otherwise, the duration would be overstated. Identifying Day 8 as the Early Finish helps set the earliest possible hand-off to the successor activity and is essential for accurate critical-path analysis.
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