The testing of Open Systems Interconnection (OSI) products is expensive and time consuming. Hence there is a great desire on the part of the suppliers of such products to have their products tested only once. At the same time, clients are seeking assurances that newly acquired OSI products will interwork with their existing systems. These two points of view cannot currently be reconciled in the absence of global arrangements on the recognition of the results of testing OSI products. In order to identify a way to proceed, the Information Technology Resources Support Group (ITRSG) recommended that the International Organization for Standardization (ISO) and the International Electrotechnical Commission (lEC) should organize an International Workshop on the Worldwide Recognition of OSI Test Results. The Workshop, which was carefully planned by a Program Committee in which most of the interested parties from North America, Europe, and "the rest of the world," i.e., Australasia, were represented was held at the National Institute of Standards and Technology (NIST) from May 6-8, 1991.