The choice overload problem is well known in psychology
□ It is necessary to do a preselection for the customer
■ Recommender systems are already very successful to decrease the choice overload problem in some domains
□ Product-to-Product Recommendation → Amazon.com
□ Movie Recommendation → NetFlix
■ Algorithms already produce great results
Evaluation still very difficult for Research. kaggle.com and tunedit.org are hosting competitions.