Nature of the problem; the need to treat it and the social benefit of its approach and solution. priority granted based on political reasons (institutional programs; etc.) and technical reasons (magnitude of the problem; consequences…). synthesis of data from the diagnosis or previous studies; as well as forecasts of transformation of the reality on which it acts. real possibilities of intervention; alluding to the availability of economic resources; technicians and materials; to previous experience; to the conditions offered by the environment at that time; etc. strategy and methodology to implement the necessary actions in order to achieve the objectives.