This full text is Professor Williams' section of the interface article 'Challenging theory: Changing practice: Critical perspectives on the past and potential of professional planning'. The full article is available at http://dx.doi.org/10.1080/14649... Read More about Challenging theory: Changing practice: Critical perspectives on the past and potential of professional planning/Professional Planning 100 years on - Have we emancipated communities?/Celebrating the idea of planning/The role of planning in the twenty-first century and beyond/Deadly sins? Living dreams!/Turning the "beast of ugliness" into "places of beauty" through sustainable.