As programs serving young children and their families increasingly work together to provide services, written agreements or contracts become more important in clarifying the roles of each partner in the collaboration. This document provides guidance in developing written agreements between Head Start programs and other programs or agencies. The guidebook begins with a definition of a partnership agreement and makes suggestions for negotiating such an agreement. The guidebook further describes the process in developing a written agreement, including: (1) creating a shared vision; (2) learning about community needs, resources, and services; (3) developing goals; (4) increasing awareness of innovative strategies; (5) deciding agency responsibilities and setting timelines; (6) committing resources; (7) developing the written agreement; and (8) developing a means of monitoring the progress of the collaborative relationship. In addition, the guidebook lists elements that all written agreements should contain. The guidebook concludes with questions agencies may keep in mind as they consider collaborating with one another and asserts that developing relationships across agencies offers a better chance of addressing needs than working on them separately and partially. A list of resources completes the guidebook. Appendices include: checklists detailing a process for crafting a system of pro-family education and human services and delineating indicators of system change; group activities to encourage agency participants to deal with difficult issues; a list of elements of successful partnership agreements/contracts; and sample written agreements between Head Start programs and child care or other agencies. (KB)