Development and implementation of the Common Core for Line Workers and Common Core for Supervisors was mandated by the Program Improvement Plan (PIP), part of the 2003 federal Child and Family Services Review (CFSR). Although in-service core training had historically been provided by the Regional Training Academies, the Inter-University Consortium, and county staff development departments, the introduction in 2005 of the common core curricula is significant: it marks the dissemination of new worker training that is standardized for the entire state. The aim of statewide standardization of Common Core Curricula is to provide consistency and equity in the application of best and evidence-based practice in all 58 California counties.