Rural landscape planning which ignores the needs and aspirations of the people who live and work in the rural areas is less than adequate. At the beginning of this century a rural settlement pattern was planned for the cereal growing and sheep raising area of the Murray Mallee in South Australia. It ensured that every farmer was within about 16 km of a railway and a small trade centre. But this planned settlement system has been modified during the post-war years. The changed status of trade centres between 1954 and 1971 is looked at in detail, the critical threshold levels at which they operate being emphasized. The factors of mechanization and enlargement of holdings, of increased personal mobility and rising rural expectations, and the re-organization of the school system and of the handling of grain by Government and by farmers' co-operatives respectively are singled out as the main agents of change. The planning implications of the changes are considered, attention being drawn to the likely future trends, the critical nature of centres in certain categories and locations, and the need to rationalize the rural settlement system in order to provide basic facilities for the rural population. These changes and adjustments are common to other parts of the wheat/sheep land-use zone in South Australia, in Eyre Peninsula, Yorke Peninsula, the Northern Areas, and generally throughout similar land-use zones in other states of the continent.