Some aspects on modelling as a base for scientific recommendations

Argues that the Hempel‐Oppenheimian logical scheme for explanations and predictions also applies to prescriptive statements (recommendations) derived from theoretical models in the normative sciences. Presents ideas concerning the allocation of effort in developing normative models for such purposes. Three characteristics of the model and the model‐building process, together with a suggested qualitative relationship between these properties, are discussed, namely the “applicability” of the model, the “simplicity” of the principle derived from the model, and the “level of technique” applied, a discussion similar to that of Bronfenbrenner. It is proposed that the subjective value to the model‐builder may be envisaged as a function of these three main characteristics and that the model‐design process then may be interpreted as a constrained optimisation problem.