-3
and to identify the principle participants involved in its construction. The intent of this section is to provide a glimpse of the product in order to focus the discussion on the constraints and issues considered in its development. Next, a review of the literature is presented for purposes of highlighting the concern others share for actually using these frameworks as a comprehensive policy-decision making tool in LDC's. Then a discussion of the issues and constraints which appear to effect the institutionalization of ASA methods in Tunisia is presented.
II. DESCRIPTION OF THE TUNISIAN ASA MODEL
The sector analysis model was developed in Tunisia. The model is
in the tradition of the Mexican ASA model (5) in the sense that a linear programming algorithm is used to solve it and in the sense that the procedures for incorporating nonlinear relationships into linear programming format (6, 12) are also included. A statement of the initial version of the model appears in (11) and a later version in (4). The present version of the model represents substantial-inputs and efforts by FAO and by our Tunisian counterparts who now have full responsibility for and control of the model.
The model is static and small by linear programming standards
having about 400 rows and 1800 columns. It is specified so that activities identify four regions of the country, where traditional modern and government farms are identified in each region. Within each region, production activities are specified for the major enterprises of wheat, feed grains, sheep, cattle, irrigated crops produced in and out of season and tree crops.