| Vol-740 urn:nbn:de:0074-740-7 Copyright © 2011 for the individual papers by the papers' authors. Copying permitted only for private and academic purposes. This volume is published and copyrighted by its editors.

# The UMAP 2011 Workshops - DEMRA 2011 and UMMS 2011:

- Decision Making and Recommendation Acceptance Issues in Recommender Systems
- User Models for Motivational Systems: The affective and the rational routes to persuasion

### Joint Proceedings of the Workshop on Decision Making and Recommendation Acceptance Issues in Recommender Systems (DEMRA 2011) and the 2nd Workshop on User Models for Motivational Systems: The affective and the rational routes to persuasion (UMMS 2011)

#### Workshops at the 19th International Conference on User Modeling, Adaptation and Personalization, UMAP 2011

### Girona, Spain, July 11, 2011.

Edited by

### Francesco Ricci (DEMRA) (*)
Giovanni Semeraro (DEMRA) (+)
Marco de Gemmis (DEMRA) (+)
Pasquale Lops (DEMRA) (+)
Judith Masthoff (UMMS) (#)
Floriana Grasso (UMMS) (^)
Jaap Ham (UMMS) (%)

(*) Free University of Bozen-Bolzano, Italy
(+) University of Bari, Italy
(#) University of Aberdeen, UK
(^) University of Liverpool, UK
(%) Eindhoven University of Technology, The Netherlands

# Table of Contents

## Decision Making and Recommendation Acceptance Issues in Recommender Systems (DEMRA 2011)

- Preface of DEMRA 2011 7
  Francesco Ricci, Giovanni Semeraro, Marco de Gemmis, Pasquale Lops

1. What Should Recommender Systems People Know About the Psychology of Choice and Decision Making? 10
   Anthony Jameson
2. Explanations in Proactive Recommender Systems in Automotive Scenarios 11
   Roland Bader, Andreas Karitnig, Wolfgang Woerndl, Gerhard Leitner
3. Context-Aware Places of Interest Recommendations and Explanations 19
   Linas Baltrunas, Bernd Ludwig, Stefan Peer, Francesco Ricci
4. Group Decision Support for Requirements Negotiation 27
   Alexander Felfernig, Christoph Zehentner, Harald Grabner
5. Exploring the Effects of Feed-forward and Feedback on Information Disclosure and User Experience in a Context-Aware Recommender System 35
   Bart Knijnenburg, Alfred Kobsa, Simon Moritz, Martin Svensson

## User Models for Motivational Systems: The affective and the rational routes to persuasion (UMMS 2011)

- Preface of UMMS 2011 44
  Judith Masthoff, Floriana Grasso, Jaap Ham

1. Motivating People in Smart Environments 47
   Berardina De Carolis, Irene Mazzotta
2. Arguing with Emotions 59
   Martyn Lloyd-Kelly, Adam Wyner
3. Adapting Engagement e-mails to Users' Characteristics 71
   Claudia Lopez, Peter Brusilovsky
4. Discrediting Moves in Political Debates 84
   Isabella Poggi, Francesca D'Errico, Laura Vincze
5. Towards an Embodied View of Flow 100
   Pablo Romero, Eduardo Calvillo-Gamez
6. Addressing the New User Problem with a Personality Based User Similarity Measure 106
   Marko Tkalcic, Matevz Kunaver, Andrej Kosir, Jurij Tasic
7. Impact of Implicit and Explicit Affective Labeling on a Recommender System's Performance 112
   Marko Tkalcic, Ante Odic, Andrej Kosir, Jurij Tasic

Download the DEMRA 2011 and UMMS 2011 proceedings in a single volume.

24-Jun-2011: submitted by Pasquale Lops
24-Jun-2011: published on CEUR-WS.org