The lessons learned from a review of thirteen existing Europe an bio-economic models used in the
evaluation of EU policies are presented.How the se models compare and differinterms of their
biological and economic components,the integration between the components, which indicators are selected and how they are used,are described and analysed.The article concludes that the multitude of
construction differences reflects the necessity of adapting the modelling approach to answer different questions. Since real life questions in fisheries are so diverse, answering them requires adiversity of models.