This double issue of Cybernetics and Human Knowing is dedicated to celebrating the life and work of Heinz von Foerster, cybernetician extraordinaire. He died on October 2nd, 2002. Mai von Foerster, his wife of over 60 years, died on June 22nd, 2003. They lived as a team and it is wrong to think of the work that appeared under the authorship of Heinz von Foerster without thinking of Mai's part i...

Due to the prominent role of recommender systems in our daily lives, it is increasingly important inform users why certain items are recommended and personalize these explanations user. In this study, we explored how a music system should be designed fit preference different personal characteristics. More specifically, investigated three characteristics that influence perception interfaces: nee...