The document presents a description of the policies and procedures of the New York City Street Crime Unit (SCU) which conducts street surveillance and decoy activities. The organization and administrative structure of the SCU is studied according to the size of a unit and the chain of command requirements. The SCU's methods for selecting and maintaining personnel are based on a profile of the model candidate, recruitment and selection procedures, specialized training programs, and group morale. The SCU functions include: deployment, patrol preparations, decoy operations, and plainclothes surveillance. Guidelines for confrontation between plainclothes officers, stop and frisk procedures, arrest procedures, and their policy implications are given. The facilities, equipment, and communication system of the SCU are examined. A discussion of the legal issue of entrapment is presented and methods for maintaining the integrity of SCU members are considered. Data on SCU costs, arrest and conviction rates, injury levels, crime reductive impact, and other outcome measures are discussed. An evaluation design for assessing the outcomes and impacts of street crime unit operations is given. Statutes, equipment inventory, interview questions, guidelines, procedures, and performance evaluation forms related to SCU activities are appended. (Author/EC)