Johan Vanwelkenhuysen

Title: Quality Requirements Analysis in Customer-Centered Software Development
Author: Vanwelkenhuysen Johan
Reference: Proceedings of the Second IEEE International Conference on Requirements Engineering, IEEE Computer Society, Colorado, USA (1996)
Abstract:
An approach to nonfunctional requirements analysis for software systems is discussed. The approach is designed to refine and analyse quality requirements, to manage change and to stress customer acceptance. Our work is driven… Show more

Title: Quality Requirements Analysis in Customer-Centered Software Development
Author: Vanwelkenhuysen Johan
Reference: Proceedings of the Second IEEE International Conference on Requirements Engineering, IEEE Computer Society, Colorado, USA (1996)
Abstract:
An approach to nonfunctional requirements analysis for software systems is discussed. The approach is designed to refine and analyse quality requirements, to manage change and to stress customer acceptance. Our work is driven by the aim to develop a technology to enable and support customer-centered (cooperative) approaches to software development. We view quality requirements analysis essentially as an outcome of argumentation-based software design. Adopting this view, we support three claims: (1) The analysis of quality requirements is inherently intertwinned in the conceptual software design process; (2) Relationships among quality requirements hold in the context of a design decision for a local problem only; (3) Priorities among competing requirements are sensitive to characteristics of the workplace in which the target system is to operate. Show less

Title: Adaptation of Reusable Knowledge for Workplace Integration
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Reference: IJCAI-95 Workshop on Context in Knowledge and Reasoning Modelling, Montreal (Canada), 1995.
Abstract:
We have analysed and compared work practice of two troubleshooters performing on the {\em same} devices, with access to the {\em same} information but adapted to {\em different} workplaces. Troubleshooting behavior adapted to one workplace was assessed as… Show more

Title: Adaptation of Reusable Knowledge for Workplace Integration
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Reference: IJCAI-95 Workshop on Context in Knowledge and Reasoning Modelling, Montreal (Canada), 1995.
Abstract:
We have analysed and compared work practice of two troubleshooters performing on the {\em same} devices, with access to the {\em same} information but adapted to {\em different} workplaces. Troubleshooting behavior adapted to one workplace was assessed as inadequate and unacceptable by the troubleshooter performing in the other workplace. Investigating justifications underlying this assessment, we realize the significant effect of forces from organizational and workplace sources on problem solving behaviors. The effects go beyond what is currently conceived in knowledge acquisition and reuse practice. We have investigated organization and workplace characteristics that account for the significant differences between the two observed troubleshooting behaviors and the way behaviors are adapted to these characteristics. Findings are exploited to improve guidance in knowledge reuse, stressing workplace integration. Show less

Title: Using DRE to Augment Generic Conceptual Design
Author: Vanwelkenhuysen Johan
Status: IEEE Expert, Volume 10, Number 1, pp. 50-56, February 1995
Abstract:
A lot of effort is being put in making available generic, and thus reusable, conceptual software designs for the benefit of knowledge system development. These generic conceptual designs define the boundaries of (alternative) solutions to a class of design problems (e.g. design of diagnostic or schedule applications). They… Show more

Title: Using DRE to Augment Generic Conceptual Design
Author: Vanwelkenhuysen Johan
Status: IEEE Expert, Volume 10, Number 1, pp. 50-56, February 1995
Abstract:
A lot of effort is being put in making available generic, and thus reusable, conceptual software designs for the benefit of knowledge system development. These generic conceptual designs define the boundaries of (alternative) solutions to a class of design problems (e.g. design of diagnostic or schedule applications). They allow the design problem to be approached as a configuration task. To increase their benefit, we propose a novel information structure to augment generic conceptual designs currently offered. Design decisions are made explicit by this information structure and their underlying rationalizations are captured. This rationalization expresses the way in which each design decision satisfies the postulated system requirements. Increased benefits of the augmented generic conceptual designs concern guidance in modifying the predefined design, in understanding implications of the modifications, and in justifying the conceptual design to interest groups. Show less

Title: An Analysis of representational design decisions to create ontologies and guidelines
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Reference: Journal of Japanese Society for Artificial Intelligence (forthcoming), 1995
Abstract:
We have analysed domain models about processor boards of an existing diagnostic knowledge system to create sharable ontologies and allow for reuse of past expertise analyses and system design experiences. Design decisions and rationales behind… Show more

Title: An Analysis of representational design decisions to create ontologies and guidelines
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Reference: Journal of Japanese Society for Artificial Intelligence (forthcoming), 1995
Abstract:
We have analysed domain models about processor boards of an existing diagnostic knowledge system to create sharable ontologies and allow for reuse of past expertise analyses and system design experiences. Design decisions and rationales behind representations in the domain models are uncovered to explain their adequacy for automated troubleshooting. This information is used to formulate guidelines which capture know-how to refine or change representations to compromise between competing non-functional requirements and aspects of the problem solving task. Purpose of these guidelines is to facilitate the reverse construction from generic ontologies to refined concepts and relationships tuned to certain task environments. These guidelines add a novel element to the technology for knowledge sharing and reuse Show less

Title: Embedding Non-Functional Requirements Analyses in Conceptual Knowledge System Designs
Author: Vanwelkenhuysen Johan
Status: Proceedings of the Ninth Knowledge Acquisition for Knowledge-Based Systems Workshop}, Banff, Canada.
Abstract:
A lot of effort is being put in making available generic, and thus reusable, conceptual software designs for the benefit of knowledge system development. These generic conceptual designs define the boundaries of (alternative) solutions to a… Show more

Title: Embedding Non-Functional Requirements Analyses in Conceptual Knowledge System Designs
Author: Vanwelkenhuysen Johan
Status: Proceedings of the Ninth Knowledge Acquisition for Knowledge-Based Systems Workshop}, Banff, Canada.
Abstract:
A lot of effort is being put in making available generic, and thus reusable, conceptual software designs for the benefit of knowledge system development. These generic conceptual designs define the boundaries of (alternative) solutions to a class of design problems (e.g. design of diagnostic or schedule applications). They allow the design problem to be approached as a configuration task. To increase their benefit, we propose a novel information structure to augment generic conceptual designs currently offered. Design decisions are made explicit by this information structure and their underlying rationalizations are captured. This rationalization expresses the way in which each design decision satisfies the postulated system requirements. Increased benefits of the augmented generic conceptual designs concern guidance in modifying the predefined design, in understanding implications of the modifications, and in justifying the conceptual design to interest groups. Show less

Title: Ontologies and Guidelines for Modeling Digital Systems
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Status: Proceedings of the Ninth Knowledge Acquisition for Knowledge-Based Systems Workshop}, Banff, Canada.
Abstract:
We analyze domain models about processor boards of an existing diagnostic knowledge system to create sharable ontologies and allow for reuse of past expertise analyses and system design experiences. Design decisions and rationales behind representations… Show more

Title: Ontologies and Guidelines for Modeling Digital Systems
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Status: Proceedings of the Ninth Knowledge Acquisition for Knowledge-Based Systems Workshop}, Banff, Canada.
Abstract:
We analyze domain models about processor boards of an existing diagnostic knowledge system to create sharable ontologies and allow for reuse of past expertise analyses and system design experiences. Design decisions and rationales behind representations in the domain models are uncovered to explain their adequacy for automated troubleshooting. This information is used to formulate guidelines which capture know-how to refine or change representations to compromise between competing non-functional requirements and aspects of the problem solving task. Purpose of these guidelines is to facilitate the reverse construction from generic ontologies to refined concepts and relationships tuned to certain task environments. These guidelines add a novel element to the technology for knowledge sharing and reuse. Guidelines and ontologies discussed here are implemented in Ontolingua. Show less

Title: Task Ontology for Reuse of Problem Solving Knowledge
Author: Mizoguchi Riichiro and Vanwelkenhuysen Johan and Ikeda Mitsuru
Status: Towards Very Large Knowledge Bases, N. Mars (editor), pages 46-59, IOS Press, Amsterdam
Abstract:
This paper presents a task ontology which plays a crucial role in reusing expertise. We first discuss a few basic issues concerning ontology for knowledge reuse. The first issue is typology of ontology stressing that there is more than one kind of… Show more

Title: Task Ontology for Reuse of Problem Solving Knowledge
Author: Mizoguchi Riichiro and Vanwelkenhuysen Johan and Ikeda Mitsuru
Status: Towards Very Large Knowledge Bases, N. Mars (editor), pages 46-59, IOS Press, Amsterdam
Abstract:
This paper presents a task ontology which plays a crucial role in reusing expertise. We first discuss a few basic issues concerning ontology for knowledge reuse. The first issue is typology of ontology stressing that there is more than one kind of ontology. The second topic is context. In order to enable knowledge sharing and reuse, knowledge should be decompiled into context-dependent and context-independent parts. In problem solving knowledge, the context is determined mainly by task structure. Based on this observation, we propose a task ontology which contributes to making the problem solving context explicit. After discussing these issues we show how to design task ontology. Finally, an overview of a task analysis interview system, MULTIS, based on task ontology is presented to illustrate how an implemented task ontology is used. Show less

Title: Workplace-Adapted Behaviors: Lessons Learned for Knowledge Reuse
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Status: Towards Very Large Knowledge Bases, N. Mars (editor), pages 270-280, IOS Press, Amsterdam
Abstract:
Any problem solving behavior integrated in organized work practice is necessarily adapted to forces originating from characteristics of the workplace, the organizational embedding, and social environment. An analysis and comparison of troubleshooting… Show more

Title: Workplace-Adapted Behaviors: Lessons Learned for Knowledge Reuse
Author: Vanwelkenhuysen Johan and Mizoguchi Riichiro
Status: Towards Very Large Knowledge Bases, N. Mars (editor), pages 270-280, IOS Press, Amsterdam
Abstract:
Any problem solving behavior integrated in organized work practice is necessarily adapted to forces originating from characteristics of the workplace, the organizational embedding, and social environment. An analysis and comparison of troubleshooting behaviors of {\em same} devices with access to the {\em same} technical information but performed in {\em different} workplaces teaches us that after adaptation (i.e. integration in on-going practice), the resulting troubleshooting behaviors are likely to become inadequate and unacceptable for other workplaces. Knowledge level models of these workplace-adapted troubleshooting behaviors show significant differences which go beyond mere refinements of one model over the other (i.e. an argument maintained by current practice in knowledge level analysis based on reusable components). We try to understand implications of this observation for the development and use of reusable problem solving components to support in knowledge analysis and system development. We present on-going research which builds upon reusable problem solving components currently offered to furnish them with contextual information to give more guided support to select and adapt predefined behaviors to specific circumstances at hand. Show less

Title: Generic Models and Their Support in Modeling Problem Solving Behaviors
Author: Rademakers Philip and Vanwelkenhuysen Johan
Reference: In Second Generation Expert Systems, J.M. David, J.P. Krivine, and R. Simmons (editors), pages 350-375 (26 pages), Springer Verlag, Heidelberg, 1993
Abstract:
Generic models have received widespread attention in knowledge based systems research (KBS) as an important aid in the process of modeling ``problem solving behavior''. However, little… Show more

Title: Generic Models and Their Support in Modeling Problem Solving Behaviors
Author: Rademakers Philip and Vanwelkenhuysen Johan
Reference: In Second Generation Expert Systems, J.M. David, J.P. Krivine, and R. Simmons (editors), pages 350-375 (26 pages), Springer Verlag, Heidelberg, 1993
Abstract:
Generic models have received widespread attention in knowledge based systems research (KBS) as an important aid in the process of modeling ``problem solving behavior''. However, little empirical evidence has been presented which justifies this role. In this article, we analyze some of our experiences with using generic models of problem solving in industrial projects. In these projects, we have relied upon generic models to support the acquisition and modeling process as advocated by current modeling methodologies. Based on these experiences, we argue that there is a real danger that practitioners might be misleaded by inappropriate generic models because current modeling methodologies do not sufficiently address the issues related to selecting, refining and instantiating generic models. To avoid this costly endeavor, we argue that modeling methodologies should emphasize more the nature of the domain, the work that people do, the role of the environment and an active role of the expert. We also emphasize the importance of a tight coupling between the modeling activity and validation. Validation should be carried out with respect to the expert source and the contribution of each model construct towards the intended goal of the models. The paper concludes with remarks on a framework that we call ``validation through remodeling''. Show less