American business has received a challenge from the federal government in a national experiment to find jobs for 500,000 "unemployables." The major purpose of this descriptive report was to develop hard facts for use by business men in making decisions concerning participation in the program. The content includes sections on: (1) Who Are the Hard-Core, (2) The Ingredients for Success, (3) The Problem of Recruiting, (4) Screening, Interviewing and Testing, (5) A Candid View of the Training Problem, (6) Anticipate Personal Problems, (7) Getting Help from the Government, and (8) Industry and the Community. The appendixes contain local sources of help in 80 major cities throughout the United States, regional offices of key manpower agencies, private sources of training assistance, and a glossary of agencies engaged in working with disadvantaged youth and hard-core unemployed. (DM)