Intelligent Interactive Systems in Knowledge-Based Environments: An Introduction.- Requirements Analysis and Design of an Affective Bi-Modal Intelligent Tutoring System: The Case of Keyboard and Microphone.- Estimating the Development Cost for Intelligent Systems.- In Search of Narrative Interactive Learning Environments.- Knowledge Acquisition for Configurable Products and Services.- Interaction Modalities in Mobile Contexts.- Automated Processing and Classification of Face Images for Human–Computer Interaction Applications.- On Developing and Communicating User Models for Distance Learning Based on Assignment and Exam Data.- Group Adaptation and Group Modelling.- PNS: A Personalized News Aggregator on the Web.