Work has been carried out for a number of years at this University on the construction and use of a disaggregated model of British Agriculture. The objective is to build a flexible research tool which can be used to indicate the farm level adjustments to changes in technology and economic conditions, and the regional and national consequences of these adjustments.The model is based on 48 recursive linear programming matrices representing the behaviour of the full-time, non-horticultural farms in Great Britain, and has been used to study supply control policies, animal feed demand and interfarm trading.Currently work is underway to produce new projections for the next two years. The model is also being used to generate a table of cross-price elasticities between the major agricultural commodities. In the future it is expected that the model will continue to be a basis for empirical work on supply response. Developments are required both in the structure of the LP models themselves, and in the apparatus in which they are embedded.