This handbook is designed to help candidates preparing for the ASQ Six Sigma Green Belt certification exam. Meant for those who already understand the basic concepts of reducing variation and improving processes, it also serves as a helpful reference to the appropriate materials needed to conduct successful Green Belt projects. The layout of the handbook is mapped to the 2022 version of ASQ’s Body of Knowledge (BoK). Roderick A. Munro is a business improvement coach with RAM Q Universe, Inc. He is also the author of several other books on Six Sigma and the IATF 16949 process. He is an ASQ Fellow, Certified Quality Engineer, Quality Auditor, and Manager of Quality and Operational Excellence. Munro is also a Fellow Chartered Quality Institute (CQI) Chartered Quality Professional (CQP) (England), and IRCA QMS Lead Auditor. Govind Ramu is a licensed professional engineer from Ontario, Canada. He has leadership executive education certification from the Stanford Graduate School of Business. Ramu is an ASQ Fellow, recipient of the ASQ Crosby Medal and ASQ LA Simon Collier Quality Award, and holds six ASQ certifications: CMQ/OE, CQE, CSSBB, CQA, CSQE, and CRE. He has co-authored books and standards, and he was the convenor for ISO 10014: 2021 international standard for which he was awarded an ISO Excellence Award. Daniel J. Zrymiak works as a project manager at RST Instruments. He is an ASQ Fellow and a recipient of ASQ’s Feigenbaum and Crosby Medals. Zrymiak’s ASQ certifications include CSQE, CQE, CMQ/OE, and multiple Quality Auditing credentials. Zrymiak is also a PMI certified PMP, has several IT credentials and has been published in numerous professional journals.