General Introduction   This Guided Inquiry examines three related themes, security, terrorism and war. Although these concepts are as old as human history itself, they have, at least here in the United Sates, taken on new dimensions because of the recent developments in war on terrorism and the issues of home land security. And for professionals in such areas as government, the security industry, law enforcement, etc., these matters are of central importance as well.   In this GI, we shall try to examine the concepts of security, terrorism, and war; the background to these concepts; the new meanings that these concepts have taken on in the light of recent developments, and of course, the ethical considerations with regard to the policies and the stakeholders in the deliberations and decisions taken and acted upon.