THIS WORKBOOK WAS DEVELOPED IN A CURRICULUM PROJECT, DESCRIBED IN VT 004 454, TO HELP YOUNG PEOPLE LEARN BASIC PRINCIPLES AND CONCEPTS OF MECHANICS AND TECHNOLOGY BY MEANS OF A SERIES OF APTITUDE TRAINING EXERCISES. IT IS THE LAST OF FOUR BOOKS WHICH PRESENT 30 EXERCISES DESIGNED FOR 30 CLASS PERIODS. THE EXERCISES ARE SIMILAR TO APTITUDE TEST ITEMS EXCEPT THAT AN EXPLANATION IS PROVIDED FOR THE PRINCIPLES INVOLVED. EXERCISES IN THIS BOOK COVER ABSTRACT REASONING, TECHNICAL COMPREHENSION, AND THREE-DIMENSIONAL VISUALIZATION FOR MECHANICAL AND ELECTRICAL PRINCIPLES AND MACHINES. ITEMS ARE MULTIPLE CHOICE OR COMPLETION QUESTIONS. ANSWERS ARE AVAILABLE IN VT 004 463. OTHER RELATED DOCUMENTS ARE VT 004 455 TO VT 004 471. (EM)