Acknowledgements; Abstract; Contents; List of Figures; List of Tables; Notation; Abbreviation; Chapter 1 Introduction; Chapter 2 Problem Definition; Chapter 3 Background; Chapter 4 Related Work; Chapter 5 Active Learning for Aspect Model; Chapter 6 Active Learning for Matrix Factorization; Chapter 7 Factorized Decision Trees; Chapter 8 Learning Active Learning; Chapter 9 Active Learning for Museum Recommender Systems; Chapter 10 Conclusion; Index; References