This book is an accumulation of strategies that help to navigate and simplify complex and common progressions in jazz. Difficulties often arise when improvisers encounter root motions that are uncommon, such as third cycles, etc. In order to simplify such progressions, multiple strategies such as substitutions and finding common elements can be used.
The book also contains advice for making improvisations more coherent and express harmony more effectively with single-note instruments.

Navigating Changes: Strategies for Simplifying Chord Progressions in Jazz