"AGILE CYBERSECURITY" CAN BE DEFINED BY THE TERM "CONSTRAINED CONTROLS"This book is a spin-off of our series on anticipated expansion and use of National Institute of Standards and Technology (NIST) based frameworks, and how they fit the terms of agile or lean development. In this book, we explore several approaches to making "agility" a reality. We discuss both the National Cybersecurity Framework and NIST Special Publication 800-171 as the kernels of the demands for greater cybersecurity in an ever-threat-filled Internet environment. We also introduce the Risk Assessment (RA) as a less-than used and understood "bridge" to agile development.