As of the writing of this report, the Common Core State Standards (CCSS) are being implemented in 45 states and the District of Columbia. Approaches to implementing the standards, however, are highly varied. For the past 3 years, Research For Action (RFA) has been tracking how one approach to implementing the literacy standards--the Literacy Design Collaborative (LDC)--has played out in diverse settings. In this document, the authors show how three of these settings--a medium-size urban/suburban district (Kenton County, Kentucky), a large urban district (Hillsborough County, Florida), and a regional educational service agency (Lancaster-Lebanon Intermediate Unit 13, Pennsylvania)--used LDC to help teachers align instruction with the CCSS. Their research shows that there are some best practices that are shared across all sites. Yet they also find that adapting to unique contextual factors is an integral part of successful implementation; and that there remain opportunities for further consideration and development at all sites. The cross-case study report is intended as a resource that can assist policymakers and education leaders in understanding the variation of best practices in LDC implementation, and also as a "road map" for sites that are considering adopting LDC tools. Four appendixes are included: (1) Data/Methodology; (2) Background Information; (3) Profile of Three Sites; and (4) Special Thanks.