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Source: http://www.wfmc.org, The Workflow Reference Model, Document Number TC00-1003. Available from http://www.wfmc.org/reference-model.html. Copyright 1993, 1994, 1995 The Workflow Management Coalition. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photographic, recording or otherwise without the prior written permission of the Workflow Management Coalition, except that reproduction, storage or transmission for non-commercial purposes may be undertaken without such permission if all copies of the publication (or portions thereof) produced thereby contain a notice that the Workflow Management Coalition and its members are the owners of the copyright therein.