Book excerpt: An instruction manual for use with the fifth edition of Understanding Fiber Optics by Jeff Hecht. This book includes an overview for instructors, answers to quizzes and "questions to think about" published in the book, worked-out solutions to selected problems with equations, and additional material to supplement the book. This is the original manual prepared and published in 2006 along with the fifth edition of Understanding Fiber Optics, with only minimal updates.