This may include the setting of specific targets and the development of different surveys to collect evidence on key features of the system and its performance. It includes issues such as: the choice of the evaluation agencies and the development of the skills to perform the evaluation of the education system, the preparation by education systems to be the subject of an evaluation, the development of competencies to effectively use the results of an evaluation for the improvement of education policies, and the design of agencies to review system evaluation results with a view to inform policy development. The objectives of system evaluation typically consist of feedback for improvement of policies, accountability of policy makers and information about the performance of the education system and the impact of policies.