Excerpts from the report Summary: Increased effectiveness of supermarket managers resulted from improved management practices developed and tested in controlled experimentation. The new practices resulted in considerably better adherence to company directives, improved employee relations in the store, and better work methods. These, in turn, led to more effort going into store merchandising, and increased sales per man-hour. The research was conducted in 28 stores of an eastern supermarket organization. New manager practices were tested in 14 of the stores and the other 14 were used as matched controls. Data used in measuring results were gathered during the same period for both groups of stores. Improved practices were developed in three broad areas of work for which store managers are responsible: (1) Adherence by employees to company directives on store merchandising; (2) the management of store employees, and (3) the application of techniques for simplifying work in the stores.