“…Some important methodological innovations or transfers were tested using telephone traffic data, including graph theoretic interpretations and matrix powering by Nystuen and Dacey (l961), extension of graph theory into hierarchisation models by Rouget (1972), the use of factor analysis on flows data by Illeris and Pedersen (1968) and its extension to obtain multi-ordered regional systems by Davies (1979) and Nader (198 1). Telephone traffic has been used for regional delineation in such diverse locations as Denmark (Illeris and Pedersen, 1968), France (Rouget, 1972), Ireland (O'Sullivan, 1969), Wales (Clark, 1973), Canada (Simmons, 1972, Nader, 1981, the United States (Nystuen and Dacey, 1961, Brown and Horton, 1970, Davies, 1979, Clayton, 1974, South Africa (Board, Davies and Fair, 1970), East Africa (Soja, 1968) and Australia (Logan el al.. 1975, Langdale, 1975, Smailes, 1969a, Holmes, 1976. Researchers have used an astonishing variety of methods for manipulating origin-destination flows matrices to extract significant information.…”