This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book examines the initial 29 inspections in Iraq—the time during which there was the most intense jockeying by Iraq to control information about its past activities and when inspectors were adjusting to their task. It focuses on chemical weapons inspections. Iraq sueceeded in producing high-purity mustard as well as the nerve agents sarin and tabun. The book also examines the biological weapons (BW) inspections. Under questioning from the first biological weapons inspection team, Iraq admitted having an offensive BW research program, but denied ever having produced weapons. The book describes the nuclear weapons inspections. It is concerned with the missile inspections. Iraq was able to extend the range of its Soviet-origin Scud missiles and to manufacture Scud components. The book describes Iraqi circumvention of export controls designed to limit nuclear, chemical, and missile proliferation.