On the basis of our examinations we have come to the conclusion that longitudinal examinations are the simplest and most up-to-date methods as well as the most cost-efficient ones to follow the decision-making, preparatory data collecting, processing and analysing opportunities serving the sustainability of agriculture better and better together with tracing down the feedback about the decisions to see if the given measure has really resulted in reaching the objectives. The method was proved to be able to supply both micro-and macro-level information in the desired breakdown, groupings and systems of connections. The development successive (panel) examination that we applied can serve as the basis of making decisions affecting huge areas by means of total listings and breakdowns. Moreover, it can also control their effects and aftermaths. We suggest the implementation of introducing this data collecting and information supplying method declared to be desirable also by the European Union. Implementation could be eased to a great extent by the fact that it is available for the organisations, as well.