Lewicki ESSENTIALS is a short paperback derivative from the main text, Negotiation. It explores the major concepts and theories of the psychology of bargaining and negotiation, and the dynamics of interpersonal and intergroup conflict and its resolution. In this revision, the organization more closely follows both Negotiation and Negotiation: Readings, Cases, and Exercises. With the low cost and short length of Essentials, it makes a great package with Negotiation RCE.