The reader can either start from the centre and read out, or start from the outside and read in. The objectives are in the centre. Here the major goal is to produce proteins to feed the breeder's family. A secondary goal is to generate family income through sales and employment. The first circle around the centre shows the factors directly affecting achievement of the objectives.
Double arrows show how several factors interact at the same level.
The second circle contains a second series of factors. The plain arrows represent the action of one factor on another. The system considered here is only a sub-system, one component of a global system of rural development, and links with the outside are barely indicated in the diagram. The programme is executed by a national organization. This structure is responsible for developing the work.