This course was written by Lindsay Hewitt and Sarah Burton, with quizzes by Julie Robson.
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Figure 1: Ross Finnie for © The Open University
Figure 2: Badge illustration © The Open University
Figure 4: © Revensis/Dreamstime.com
Figures 5 and 6: courtesy of Sarah Burton for The Open University
Figure 7: © Marek Uliasz/Dreamstime
Figure 11: © Logorilla/iStockphoto.com
Figure 12: courtesy of Sarah Burton for The Open University
Figure 14: Gill Ryan for © The Open University
Figure 15: © Globalstock/iStockphoto.com
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