Patterns for software development have been a hot topic for some time within the object-oriented community. Patterns are part of a software engineering problem-solving discipline. It all started with Design Patterns [11], but gradually patterns were used in a larger number of areas of system...

Software productivity is generally measured as the ratio of size over effort, whereby several techniques exist to measure the size. In this paper, we propose the innovative approach to use an estimation model as productivity measurement. This approach is applied in a case-study at the...

In this paper we report on the results of a European survey on business/ICT alignment practices. The goal of this study is to come up with some practical guidelines for managers on how to strive for better alignment of ICT investments with business requirements. Based on Luftman's alignment...

Current methods of evaluating the quality of recommender systems are based on averages of metrics such as the average normalized discounted cumulative gain, average diversity and average reciprocity. Averages of metrics give a good sense of the overall quality of the recommendations, but not of...

In this report, we discuss the use of Petri Net language theory for business process modeling. Essentially, the focus is on the opportunities of the modeling technique for analysis and verification. Semantic compatibility, as opposed to syntactic compatibility, is concerned with the...

Publish/subscribe systems are getting more and more integrated into the execution of business processes in process aware information systems. This integration enables the distribution of the process logic and increases the scalability and adaptability of the process enactment infrastructure. A...

The WS-Events specification consists of ‘a set of processing rules for advertising, subscribing, producing and consuming Web services Events’. All authors of this specification are based at Hewlett-Packard. Further development of WS-Events is not on the agenda anymore. Therefore we only give...

The concept of variability is not new in software engineering, but current research mostly remains vague about the overall variability concept when it comes to giving a clear overview of the dimensions of variability. In this paper we evaluate the core variability concept by proposing an...

There is a consensus among academics and practitioners that ICT investments should be carefully justified, measured and controlled. This is not different for the development of a service architecture or the development of particular services as such. In practice, the traditional capital...