Introduces the nine papers in a special issue focusing on progress toward digital libraries. Articles fall into three categories: history and activities about digital libraries (DL); understanding digital library users; and extending and integrating through digital libraries. (AEF)

The Perseus Digital Library (PDL), under continuous development since 1987, is one of the primary digital resources for the humanities. A summary of the PDL genesis and current status is given and the multifaceted and longitudinal evaluation effort is described. A brief synthesis of results is provided and reflections on the evaluation along with…