The Unified Modelling Language (UML) ostensibly assumes a four level (meta) modelling framework, both for its definition and for the conceptual context in which its users operate. In practice, however, it is still dominated by the traditional two level (model + data) view of object modelling and neither supports nor applies the four level framework properly. This not only diminishes the clarity...

In this paper we present Unified Communications (UC) as a new class of communication systems, marketed by vendors as a means for integrating communication media and creating presence awareness. Designed as complex infrastructures, UC systems enfold their full potential when being customised to a particular social context. In doing so, the technology allows creating contextspecific presence sign...

This paper concerns emotion modeling for a taskindependent agent by integrating a module of needs. Inspired by theoretical views with regards to human needs, we suggest that appraisals can be confined within various scopes of needs, and to demonstrate this, we propose an emotion framework which allows control over appraisals via pre-defined levels of needs, urgency or priorities.

The definition of the exact meaning of conceptual modeling constructs is considered a relevant issue since it contributes to their effective and appropriate use by conceptual modelers. This paper studies three related constructs that enhance the expressiveness of the UML language about associations and which still lack a complete and comprehensive study, namely, association subsetting, speciali...

International Institute for Applied Systems Analysis Laxenburg, Austria

This paper is a brief comparison between the Interactions of UML 2.0 as defined by the Final Adopted Specification (OMG ptc/03-07-06) and MSC-2000 as defined by Z.120 (ITU 1999). The comparison investigates whether UML 2.0 has serious shortcomings relative to MSC-2000. The paper also discusses whether MSC-2000 is still needed in the future or should be retired.