The news and images of active shooter incidents are all too familiar. Our reaction is shock, disbelief and outrage. We ask ourselves, why did it happen? How could this happen? What motivated those individuals to commit such acts of violence? The recent wave of active shooter attacks, such as the ones in Newtown, CT, Aurora, CO, Tucson, AZ, and Utoya, Norway, were not the first active shooter attacks and unfortunately, most experts in the field agree, it is not likely to be the last. The first step in addressing the challenge and staying ahead of active shooters is education; knowing what to look for and taking steps to preventing active shooter incidents from occurring. If we're going to be successful, it's up to each of us to play an active role in the fight against the threat of active shooter. You, through individual awareness, training, and preparation, are a vital part in that fight. This book provides fundamental information regarding active shooter environment and was designed to be an informative guide. It provides basic steps in an active shooter environment and individual self-defense measures. I'm confident this guide will be extremely helpful in addressing the issue of active shooter and furthermore provide basic information on actions to take if the unthinkable happens to you - an active shooter incident.