WRITTEN TO IMPLEMENT THE PRINCIPLES SET FORTH IN "DESIGN FOR THINKING" (SEE TE 000 457.), THIS BOOK DEALS WITH WORDS AS TOOLS OF THOUGHT AND WITH THE PROBLEM-SOLVING FUNCTION OF LANGUAGE. CHAPTERS ARE ON (1) QUALIFICATION, CLASSIFICATION, AND ABSTRACTION, (2) SIGNS, REPRESENTATIONS, SYMBOLS, AND MATRICES, (3) ANALYSIS (BY CLASSIFICATION, STRUCTURE, AND OPERATION), (4) SEMANTIC GROWTH AND ITS IDENTIFICATION, DISCOVERY, AND CREATION, (5) ANALOGIES (ARTIFICIAL AND FUNCTIONAL), (6) DEFINITION (BOTH ITS CLASSIFICATIONS AND ITS CREATION), AND (7) PROBLEM-SOLVING THEORIES (SIMPLIFIED AND OPERATIONAL). THE CHAPTERS ARE COMPOSED OF TEXTUAL SECTIONS WHICH PRESENT AND EXPLAIN PRINCIPLES, AND EXERCISE SECTIONS WHICH PROVIDE PROBLEMS, OFTEN STRUCTURED IN AN ORDER OF INCREASING DIFFICULTY, FOR APPLYING THE PRINCIPLES. THE BOOK IS PUBLISHED BY E.P. DUTTON AND CO., INC., NEW YORK, $4.50. (MM)