Part of a volume which explores current issues in service delivery to infants and toddlers (ages birth to 3) with handicapping conditions, this chapter discusses the process of change in relation to policy implementation of Public Law 99-457, beginning with an analysis of congressional, federal, and state dimensions. The concept of change is viewed as a dynamic process of ensuring that early intervention policies, ideas, programs, products, or systems (PIPPS) are put into practice within local communities and states. Phases of user decision making are outlined (awareness, interest, evaluation, support, resources, try-out, preoperations), and a planning approach to guide implementation is described. The lead agency and the state interagency coordinating council are seen as primary leaders of the implementation effort. References are appended. (JW)