The 26th Yearbook of the National Society for the Study of Education is an essential resource for educators and curriculum specialists seeking to understand the foundational principles and techniques of curriculum construction. Written by Harold Rugg, one of the leading authorities on curriculum development, this volume provides a comprehensive overview of the history, theory, and practice of curriculum construction, drawing on a wide range of disciplines and intellectual traditions. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.