Ulrich, Karl T2023-05-222023-05-222006-03-282018-01-31Ulrich, Karl T. 2011. Variety. In K. T. Ulrich.(ed) Design: Creation of Artifacts in Society. (pp. 113-128)University of Pennsylvania. (ISBN 978-0-9836487-0-3)https://repository.upenn.edu/handle/20.500.14332/40430All rights reserved. Except for brief quotations used for purposes of scholarly citation, none of this work may be reproduced in any form by any means without written permission from the publisher. For information address the University of Pennsylvania Press, 3905 Spruce Street, Philadelphia, Pennsylvania 19104-4112Art and DesignManagement Sciences and Quantitative MethodsBook Chapter