The first conference consisted of papers from six organizations: Bell Telephone Laboratories, General Electric, RCA, Philco, Massachusetts Institute of Technology and the University of Pennsylvania. The registration was $4 (early registration was $3) and 601 people registered. International attendees arrived from Canada, England and Japan. With subsequent conferences came many more international participants with the first international presentation in 1958. By 1965, the number of overseas program committee members increased to 8 and in 1970 the overseas members began meeting separately in both Europe and Japan. Selected members of these regional program committees would attend the final program meeting in America.