Learn how to calculate slack time in Lean Six Sigma project tracking. Understand why slack time equals the difference between latest start and earliest start dates, ensuring efficient project management.
Table of Contents
Question
Lean six sigma certification holders know that when talking about project tracking slack time equals:
A. Critical path minus latest start date
B. PERT divided by CPM
C. Earliest start date minus critical path
D. Latest start date minus earliest start date
Answer
D. Latest start date minus earliest start date
Explanation
When discussing project tracking in Lean Six Sigma, slack time refers to the amount of time a task can be delayed without impacting the overall project timeline.
The correct formula for calculating slack time is:
Slack Time = Latest Start Date (LST) – Earliest Start Date (EST)
This formula determines the flexibility within a project’s schedule for non-critical tasks. Here’s a breakdown of why the correct answer is D. Latest start date minus earliest start date:
Definition of Slack Time: Slack (or float) is the time buffer that allows a task to be delayed without affecting subsequent tasks or the project’s completion date. Tasks on the critical path have zero slack, meaning any delay directly impacts the project timeline.
Calculation of Slack Time: To compute slack time, project managers identify:
- Earliest Start Time (EST): The soonest a task can begin, considering dependencies.
- Latest Start Time (LST): The latest a task can begin without delaying the overall project.
Subtracting EST from LST gives the available slack for that task.
Importance in Project Management: Slack time helps managers allocate resources efficiently, anticipate delays, and maintain flexibility in scheduling. It is particularly useful for identifying non-critical tasks that can be delayed without jeopardizing the project’s success.
Incorrect Options Explained
- A: Critical path minus latest start date is not a valid formula.
- B: PERT divided by CPM is unrelated to slack time calculation.
- C: Earliest start date minus critical path does not define slack.
Thus, the correct choice is D, as it accurately represents how slack time is calculated in project management and aligns with Lean Six Sigma principles.
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