Optical Character Recognition (OCR) document. WARNING! Spelling errors might subsist. In order to access to the original document in image form, click on "Original " button on 1st page. PREFACE This publication is the fifth in the series entitled “Studies in Technical and Vocational Education ” distributed by the Section for Technical and Vocational Education, UNESCO within the framework of UNEVOC Project. UNEVOC is the acronym of UNESCO’s International Project on Technical and Vocational Education, which was launched in 1992. This project focuses primarily on the exchange of information, networking and other methods of international co-operation between specialists in technical and vocational education. This study has been prepar...