This special issue on community-based interdisciplinary research grew out of the work of the SCRA Interdisciplinary Task Force and an Interdisciplinary Working Conference held at Vanderbilt University in May, 2004. In this introduction to the special issue, the historical context for interdisciplinary underpinnings for community psychology theory, research, action and training is first depicted. This is followed by a brief description of the mission and work of the recent SCRA Interdisciplinary Task Force and the Interdisciplinary Working Conference. The introduction concludes with a brief summary of the papers in the two main sections of the special issue, Prospects and Perspectives (four scholarly papers and three commentaries) and Community-Based Interdisciplinary Action-Research (four interdisciplinary action-research projects).