The theme of the current workshop was identified several years ago and was considered by the working group of the National Large Bowel Cancer Project to be an appropriate workshop topic. Although the subject was important then, it was not possible to conduct such a workshop at that time. In the interim, not only did the problems associated with colorectal metastasis still exist, but new insights on the biology and treatment of colorectal cancer metastasis emerged, making the workshop topic especially important and relevant. With input from an expert Planning Committee, a unique program was designed to provide an opportunity for information exchange between basic scientists and clinical investigators. The published proceedings reflect the organization of the workshop which consisted of five sections: Section I. The Biology of Colorectal Cancer Metastasis co-chaired by Drs. J. Isaiah Fidler and George Poste Controversies in the Management of Patients with Colorectal Cancer Section II.