The opening article traces the development of a Rockford, Ill., association of public police and private security representatives intended to facilitate cooperation in dealing with various offenses. This is followed by a summary of the Hallcrest Report, a 30-month national study of relationships between law enforcement and private security operations in the delivery of protective services. The summary focuses on employment figures, perceptions and attitudes, licensing and regulation, 'moonlighting,' and the problem of false alarms. Some general recommendations are offered based on the findings. Another article describes the structured cooperation between a large private security firm and the police in Amarilllo, Tex. Joint activities have included cooperative response to alarms, cooperation in neighborhood patrol programs, and K-9 training. The third article describes the curriculum of the Private Security Institute of Chicago, Ill., a school intended to provide quality instruction to all members of the security industry. The costly problem and causes of false alarms are considered in another article, and Atlanta's model program of cooperation between the police, the security industry, and the community to deal with the problem of false alarms is described. Partnerships between public and private sector agencies to deal with particular types of crime are advocated in the article that describes such a program for a shopping mall in Montclair, Calif. The concluding article focuses on the procedures used by Bally Manufacturing Corp., a gaming and amusement enterprise, to protect against organized crime's encroachment on its business activities.