The authors consider several variables in their relations with each other in a simple table of aspects. The different independent tendencies controlling farming are clearly seen. After this analysis the connections and tendencies found are interpreted with concrete figures. The empirical reality must then be confronted with the theoretical possibilities to solve the problems indicated. A. (Abstract retrieved from CAB Abstracts by CABI’s permission)

A number of observations was constructed artificially by giving the independent vari ables of a system of equations various values ; in this way the values of the dependent variables could be computed. Next these data have been analysed by factor analyses of which the results were compared with the content of the original model. It appears, that the number of aspects is equal to the number of independent vari ables. It is very difficult to interpret the results of these analyses without rotation. This rotation must be performed according to the caumax method: the possibility to a causal interpretation is maximized by a rotation in which every reference axis is rotated as much as possible upon an independent variable ; the dependent variables are not taken into account. By this an identification of the factor analytical model is obtained. The results are not altered very greatly by error factors and correlations between the independent variables.