School Readiness profiles measured countywide at kindergarten entry provide important, population-based information about the developmental capacities of children as well as the capacity of families, pre-schools, and communities to support children's school readiness. These profiles enable key stakeholders to plan, evaluate, and improve programs, services, and systems that help children prepare for and succeed in school. In Ventura County, as in many counties nationally, school readiness is not consistently measured across school districts. This represents a missed opportunity to systematically assess the programs, policies and services that are available to help children succeed in school. As part of its system-building effort, First 5 Ventura County funded a pilot study to develop school readiness profiles comprised of children entering kindergarten and their families in four school districts in the fall of 2004. In the short-term, the goal of this pilot study is to understand the logistical process of collecting multi-district school readiness data. In the mid-term, the goal of this effort is to expand comparable data collection to additional school districts so that a uniform measure can be implemented countywide in order to produce School Readiness profiles that are representative of all children in Ventura County. In the long-term, the goal is to institutionalize regular and systematic School Readiness profiles as an important and well accepted component of a county wide, data driven school success policy. This report provides background regarding the importance of school readiness; describes the methods and processes used to conduct the pilot study; summarizes the key findings of the School Readiness Profiles Pilot Study; and recommends strategies for expanding the pilot study in coming years based on the lessons learned from this report. The following are appended: (1) Modified Desired Results Developmental Profile (MDRDP); (2) Ventura County Pilot Parent Survey; (3) Memorandum of Understanding; (4) Process of Recruitment and Coordination; (5) MDRDP Rubric; and (6) Descriptive Tables. (Contains 14 tables and 1 figure.) [This project was made possible through funding and support from the Center for Excellence in Early Childhood Development and First 5 Ventura County.]