Free Float

The maximum time an activity can slip without pushing the early start of any successor or breaking a schedule constraint.

Key Points

  • Free float is measured for a single activity relative to its immediate successors.
  • Computed as the earliest successor's early start minus the activity's early finish, adjusted for leads/lags and constraints.
  • If a successor is scheduled to start as soon as this activity finishes, the free float is zero.
  • Different from total float, which is based on the overall path or project finish date.

Example

Activity B finishes (EF) on day 8. Its earliest successor, Activity C, has an early start (ES) on day 10. Free float for Activity B is 2 days (10 - 8). B can be delayed up to 2 days without delaying C's early start or violating any schedule constraint.

PMP Example Question

Which statement best describes free float?

  1. The total time an activity can slip without delaying the project completion date.
  2. The time an activity can be delayed without delaying the early start of any successor or violating a schedule constraint.
  3. The slack available to the entire network path on which the activity lies.
  4. The extra time created by assigning additional resources to an activity.

Correct Answer: B — The time an activity can be delayed without pushing a successor's early start or breaking a constraint

Explanation: Free float looks only at the relationship between an activity and its successors, not the overall project finish or full path slack.

Advanced Lean Six Sigma — Data-Driven Excellence

Solve complex problems, reduce variation, and improve performance with confidence. This course is designed for professionals who already know the basics and want to apply advanced Lean Six Sigma tools to real business challenges.

This is not abstract statistics or theory-heavy training. You’ll use Excel to perform real analysis, interpret results correctly, and apply tools like DMAIC, SIPOC, MSA, hypothesis testing, and regression without memorizing formulas or relying on expensive software.

You’ll learn how to measure baseline performance, analyze process capability, use control charts to maintain stability, and validate improvements using statistical evidence. Templates, worked examples, and structured walkthroughs help you apply each concept immediately.

Learn through a complete, real-world Lean Six Sigma project and develop the skills to lead data-driven improvements with credibility. If you’re ready to move beyond basics and make decisions backed by data, enroll now and take your Lean Six Sigma expertise to the next level.



Launch your Agile career!

HK School of Management helps you master Agile and Scrum—faster. Learn practical playbooks, AI-powered prompts, and real-world workflows to plan smarter, deliver sooner, and keep stakeholders aligned. For the price of lunch, you’ll get templates, tools, and step-by-step guidance to level up your projects. Backed by our 30-day money-back guarantee—zero risk, clear path to results.

Learn More