This document is the result of input from representatives of state fire chiefs associations from across the country, who attended a meting hosted by the IAFC in February 2006, as well as those who have undertaken the development of an intrastate mutual aid plan for the fire service. The intent is to provide a guide to assist the fire service in any state to develop or enhance intrastate mutual aid plans. Towards that goal, this guide includes: a generic planning process, recommended functional components of a plan, a section with best practice “tips” to help with planning, and a section with some obstacles and supporting factors that were identified as possibly affecting the development of a plan.