Book excerpt: In his first book, William Mora, a 30-year fire service veteran and firefighter safety advocate, discusses how to prevent traumatic structural firefighter fatalities. Firefighter disorientation can be defined as “the loss of direction due to the lack of vision in a structure fire.” To combat this problem, Mora outlines a multipronged approach to effectively address the components that contribute to disorientation and structural firefighter fatalities. This text includes many case studies and guidelines for size-up factors and is an important resource for all firefighters.