This Working Group concentrated on issues associated with ion sources and separators, summarizing both the state of the art in these areas as well as needs and requirements for first stages of the ISL post-accelerator. This report is divided into three sections: a summary of presentations made to the Working Group, a comparison of ion source technologies, and a discussion of front-end configuration issues. A concluding section summarizes key design issues novel to the ISL application, and points out areas where technology development is required.