09/14/2026
150 questions. 70% to pass. Here's what each belt exam actually demands.
The honest answer to "how hard is the exam" depends entirely on which belt and which certifying body you're asking about — and most people compare notes across bodies without realizing the exams aren't really equivalent.
A Yellow Belt exam tests foundational vocabulary and basic tool recognition — approachable for someone brand new to the field. Green Belt steps up to applying DMAIC tools to real scenarios, not just naming them.
Black Belt goes further into statistical analysis and project leadership judgment calls, where there often isn't one obviously correct answer.
The practical takeaway: don't calibrate your prep time off a friend's experience with a different belt, or a different certifying body's exam format — ASQ and IASSC genuinely test differently, even at the same belt level.
Full belt-by-belt breakdown: https://sixsigmadsi.com/how-difficult-is-the-lean-six-sigma-exam?utm_source=social+media+post&utm_medium=linkedin
What belt are you studying for right now?