How have the results from PISA been received in the Nordic countries?

What discussions have followed and what explanations have been brought forward? Conclusions from the Pisa results in Estonia and what we can learn from them. Responsible for the Pisa survey from each Nordic country and Estonia. Oskar Haukur Nielsson, Island, Hjalte Meilvang, Denmark, Fredrik Jensen, Norway, Mari-Pauliina Vainikainen, Finland and Maria Axelsson, Sweden.