The purpose and scope of this book are outlined in Chapter 1. It is suggested that the student or other reader start there and then go to Chapter 4 for a study of the fundamentals of member performance. Chapter 4 was written by Dr. George Winter and edited by me. Its final form and content are soley my responsibility. While studying Chapter 4, the beginning student may wish to go back to Chapter 2 for a general description of steel structures. Chapter 3 is for more use in determining the loads and forces used in the design of assembled structures and may be omitted or skimmed in the first reading. Chapters 5 and 6 treat the behavior and proportioning of members, connections, and a few frames in considerable detail. Topics from these two chapters can form the framework for senior or graduate level courses and should be of interest to design engineers in practice. Chapter 7 is brief review of fatigue and brittle fracture.