Here are the refereed proceedings of the 4th International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems, AH 2006, held in Dublin, Ireland, June 2006. The book presents 22 revised full papers and 19 revised short papers together with abstracts of 3 keynotes, 12 poster papers, and 14 doctoral consortium posters. Topics include pioneering theories, techniques, and innovative technologies to provide dynamic personalization, adaptation, and contextualization of hypermedia resources and services.

Keynote Speakers.- Knowledge-Driven Hyperlinks: Linking in the Wild.- Scrutable Adaptation: Because We Can and Must.- Adapting NLP to Adaptive Hypermedia.- Full Papers.- Cross-Technique Mediation of User Models.- Authoring Adaptive Learning Designs Using IMS LD.- Ways of Computing Diverse Collaborative Recommendations.- Addictive Links: The Motivational Value of Adaptive Link Annotation in Educational Hypermedia.- An Adaptive Personalized Recommendation Strategy Featuring Context Sensitive Content Adaptation.- An Empirical Study About Calibration of Adaptive Hints in Web-Based Adaptive Testing Environments.- Combining Adaptive Hypermedia Techniques and Ontology Reasoning to Produce Dynamic Personalized News Services.- Social Navigation Support in a Course Recommendation System.- Cooperating Search Communities.- Temporal Rules for Predicting User Navigation in the Mobile Web.- The Value of QoE-Based Adaptation Approach in Educational Hypermedia: Empirical Evaluation.- GLAM: A Generic Layered Adaptation Model for Adaptive Hypermedia Systems.- Recomindation: New Functions for Augmented Memories.- Automating Semantic Annotation to Enable Learning Content Adaptation.- A Scalable Solution for Adaptive Problem Sequencing and Its Evaluation.- Interactions Between Stereotypes.- Adaptation of Cross-Media Surveys to Heterogeneous Target Groups.- The Effect of Adapting Feedback Generality in ITS.- An Authoring Tool for Building Both Mobile Adaptable Tests and Web-Based Adaptive or Classic Tests.- ASHDM - Model-Driven Adaptation and Meta-adaptation.- Visualizing Personal Relations in Online Communities.- A Comparative Study of Compound Critique Generation in Conversational Recommender Systems.- Short Papers.- Adapting Educational Hypermedia to Interaction Behaviors.- UbiquiTo-S: APreliminary Step Toward Semantic Adaptive Web Services.- Considering Additional Adaptation Concerns in the Design of Web Applications.- Towards Measuring the Cost of Changing Adaptive Hypermedia Systems.- Adaptive Patient Education Framework Featuring Personalized Cardiovascular Risk Management Interventions.- Using Contexts to Personalize Educational Topic Maps.- Combining Coherence and Adaptation in Discourse-Oriented Hypermedia Generation.- A Graph-Based Monitoring Tool for Adaptive Hypermedia Course Systems.- Much to Know About History.- Learning Object Context for Adaptive Learning Design.- Personalised Navigation System with Multidimensional Linkbases.- Personalized Navigation in Open Information Space Represented by Ontology.- A Unified Approach to Adaptive Hypermedia Personalisation and Adaptive Service Composition.- Can Adaptive Systems Participate in Their Design? Meta-adaptivity and the Evolution of Adaptive Behavior.- A System for Adaptive Information Retrieval.- Describing Adaptive Navigation Requirements of Web Applications.- Learning Styles Adaptation Language for Adaptive Hypermedia.- Context-Based Navigational Support in Hypermedia.- Contextual Media Integration and Recommendation for Mobile Medical Diagnosis.- Posters.- User Modelling: An Empirical Study for Affect Perception Through Keyboard and Speech in a Bi-modal User Interface.- The AHES Taxonomy: Extending Adaptive Hypermedia to Software Components.- Web-Based Recommendation Strategy in a Cadastre Information System.- Topic-Centered Adaptive Curriculum for E-Learning.- Semantic-Based Thematic Search for Personalized E-Learning.- Adaptation in Adaptable Personal Information Environment.- Towards Formalising Adaptive Behaviour Within the Scope of E-Learning.- Informing Context to Support AdaptiveServices.- eDAADe: An Adaptive Recommendation System for Comparison and Analysis of Architectural Precedents.- On the Dynamic Adaptation of Computer Assisted Assessment of Free-Text Answers.- An Adaptive Hypermedia System Using a Constraint Satisfaction Approach for Information Personalization.- My Compiler Really Understands Me: An Adaptive Programming Language Tutor.- Doctoral Consortium.- Adaptive Learning for Very Young Learners.- A Collaborative Constraint-Based Adaptive System for Learning Object-Oriented Analysis and Design Using UML.- Decentralized Mediation of User Models for a Better Personalization.- From Interoperable User Models to Interoperable User Modeling.- Assessment of Motivation in Online Learning Environments.- User-System-Experience Model for User Centered Design in Computer Games.- Adaptive Support for Cross-Language Text Retrieval.- Some Ideas for a Collaborative Search of the Optimal Learning Path.- Interception of User's Interests on the Web.- Intervention Strategies to Increase Self-efficacy and Self-regulation in Adaptive On-Line Learning.- Dynamic Content Discovery, Harvesting and Delivery, from Open Corpus Sources, for Adaptive Systems.- Personalised Multimodal Interfaces for Mobile Geographic Information Systems.- A Model for Personalized Learning Through IDTV.- Performance Enhancement for Open Corpus Adaptive Hypermedia Systems.- Personalized Navigation in the Semantic Web.