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This is the Final Report from research undertaken in CURDS for ONS as part of the process leading up to the 2007 definition of revised Travel-to-Work Areas (TTWAs). The task for the research was to review the TTWA definition method and to analyse the 2001 Census data, so as to define the maximum possible number of separate TTWAs that satisfy appropriate statistical criteria; these criteria ensure the TTWAs meet all the relevant guiding principles for labour market area boundary definitions. In this report there is an explanation of the background to these principles, a review of the opportunities open to the research, an exposition of the innovations in the definition method and visual insights into the way the method works, some analysis of the results’ sensitivity to changes in the method or statistical criteria, a summary of the geographical and statistical characteristics of the new TTWAs, and a brief evaluation of the research and some possible ways in which it could be extended.