Business Process -- A Rule-Based Approach for Model Management in a User Interface - Business Alignment Framework -- Towards Intuitive Modeling of Business Processes: Prospects for Flow- and Natural-Language Orientation -- Supporting Business Model Modelling: A Compromise between Creativity and Constraints -- Design Process -- A Service-Oriented Approach for Interactive System Design -- Facilitating Adaptation in Virtual Environments Using a Context-Aware Model-Based Design Process -- Model Driven Approach -- Task Models for Safe Software Evolution and Adaptation -- Coherent Task Modeling and Execution Based on Subject-Oriented Representations -- Weighting Task Procedure for Zoomable Task Hierarchy Modeling of Rich Internet Applications -- Task Modeling -- Task Modelling Using Situation Calculus -- Formally Expressing the Users' Objects World in Task Models -- Task Models and UML -- iUCP - Estimating Interaction Design Projects with Enhanced Use Case Points -- Agent-Based User Interface Generation from Combined Task, Context and Domain Models.

This book constitutes the refereed proceedings of the 8th International Workshop on Task Models and Diagrams for User Interface Design, TAMODIA 2009, held in Brussels, Belgium, in September 2009. The 12 revised full papers presented were carefully reviewed and selected from numerous submissions for inclusion in the book. The workshop features current research and gives some indication of the new directions in which task analysis theories, methods, techniques and tools are progressing. The papers are organized in topical sections on business process, design process, model driven approach, task modeling, and task models and UML.