Hayes-Roth, Frederick., Advice-taking and knowledge refinement : an iterative view of skill acquisition / Frederick Hayes-Roth, Philip Klahr and David J. Mostow - iii, 39 pages ; 28 cm. - The Rand paper series; P-6517 . - The Rand paper series; P-6517 . Includes bibliographical references: pages 38-39 Subjects--Topical Terms: Learning, Psychology of.