Bill was an active member of International Society of City and Regional Planners (ISOCARP). He wrote a number of papers over the years, several of which are presented below.
Bill Twitchett, Canberra: Political decisions, planning and sustainable development, 38th ISOCARP Congress 2002
Bill Twitchett, The "Convivial Region," 39th ISoCaRP Congress 2003
Bill Twitchett, Typology of Urban Regions, 40th ISoCaRP Congress 2004
Bill Twitchett, Regional Spaces, Creativity and Sustainable Cities, 41st ISoCaRP Congress 2005
Bill Twitchett, Convivial Regions Versus Sprawl, 44th ISOCARP Congress 2008