This document contains a summary of key points about customers' roles in service delivery from a chapter on the topic. It discusses three main customer roles: as productive resources who contribute effort to production, as contributors to quality and satisfaction by providing feedback, and as potential competitors to internal service delivery. The chapter explains that customers can both enhance and detract from other customers' satisfaction. It also provides strategies for effectively involving customers, such as defining jobs for customers to perform, educating them on their roles, and rewarding good performance. The proliferation of self-service technologies is discussed as an example of maximizing customer participation.