Quick Facts
Online Yes
Format Instructor-led
Course Fee $395
Course Availability Access at any time
Time to Complete 6-month access
Prerequisites None

The online Six Sigma Green Belt Refresher is designed for previously certified Lean Six Sigma professionals who would like to brush up on their Lean Six Sigma Green Belt-level knowledge and/or prepare to complete Purdue University’s online Lean Six Sigma Black Belt course. Because courses offered by other providers may diverge somewhat from Purdue’s own course, our Green Belt Refresher helps ensure that all of the students who enroll in the Black Belt course have the necessary tools to succeed.

The Refresher also provides students with an opportunity to test out of the Lean Six Sigma Green Belt Certification Online program, which is one of two prerequisite courses for the Lean Six Sigma Black Belt. The online Lean Principles course is the other prerequisite.

Students who pass the Green Belt Refresher pre-assessment can register for Lean Principles and, upon completion, the Six Sigma Black Belt course. Professionals who obtained their Green Belts more than a few years ago through a company program or from a provider with somewhat different standards than those of Purdue, may find that they need to fully complete the Green Belt Refresher course before advancing in the certification process. If the pre-assessment indicates, however, that a student has major deficiencies in Green Belt-level knowledge, they will have to take the Lean Six Sigma Green Belt course to advance.

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To learn more about Purdue University’s online Green Belt Refresher Course and , fill out this form. You can also call (888) 390-0499 to speak to one of our program advisors.

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How the Green Belt Refresher Works

The instructor assesses a student’s Green Belt-level knowledge through a structured online venue and phone interview. If they identify knowledge gaps during the assessment process, they will give students up to 12 assignments designed to strengthen their Lean Six Sigma knowledge and address any deficiencies.

After the initial online assessment and phone interview, the Green Belt Refresher is primarily a self-study course. Instructors are available to interact with students via the online environment, email and phone.


Students have six months to complete the course once access is provided. They must begin the pre-assessment within three weeks of receiving course access.