This document provides information about achieving CMMI maturity level 5 and references a book titled "Decoded High Maturity CMMI Dev and SVC" that offers guidance. It notes that achieving high maturity requires implementing CMMI, developing process performance models, and applying statistical techniques. The book is said to provide an end-to-end explanation with examples to help organizations achieve ML5 implementation and baseline their process performance to enable process innovations. Links are provided to purchase the book on Amazon.