Overview of nuclear reaction models used in nuclear data evaluation

A brief outline of nuclear reaction mechanisms including the optical model, the Distorted Wave Born Approximation, the Coupled Channels, classical and quantum-mechanical preequilibrium models and the Compound Nucleus is given . The relations among different nuclear reaction and structure models are i ndicated. The paper is addressed to the users of nuclear data and seeks to explain basic physical concepts and the role of nuclear reaction models in data evaluation.