This episode's headline: Worker Retraining. The guests include HERBERT STRINER, Manpower Expert; HUBERT HARRIS, Associated Builders and Contractors; In San Francisco (Facilities: KQED-TV): DONALD EPHLIN, UAW. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; KENNETH WITTY, Producer; GORDON EARLE, Reporter; Video Segment: MARK BENJAMIN, Camera; ALVIN KRINSKY, Sound; DAVID PENTECOST, Editor