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A
e Abreu, F. B., and M. Goulão, "A Merit Factor Driven Approach to the Modularization of Software Systems", L'Object, 2001. Abstract

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Espada, P., M. Goulão, and J. Araújo, "Measuring Complexity and Completeness of KAOS Goal Models", International Workshop on Empirical Requirements Engineering (EmpiRE 2011), at the 19th International Requirements Engineering Conference (RE 2011), Trento, Italy, IEEE Computer Society, 30 Aug., 2011. Abstract

http://dx.doi.org/10.1109/EmpiRE.2011.6046252

espadagoulaoaraujo2011empire.pdf

KAOS is one of the most well-known goal-oriented requirements engineering approaches. Nevertheless, building large KAOS models sometimes results in incomplete and/or complex requirements models that are difficult to understand and maintain. These shortcomings often lead to an increase in costs of product development and evolution. Therefore, for large-scale systems, the ability to manage the complexity and completeness of KAOS models is essential. In this paper, we propose a metrics suite for supporting the quantitative assessment of KAOS models complexity and completeness, in order to support their early identification. We apply the metrics to an example taken from a health club system specification.

Esteves, R., and M. Goulão, MOODKIT G1, : IST/UTL, November, 1995. Abstract

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Gralha, C., J. Araújo, and M. Goulão, "Metrics for measuring complexity and completeness for social goal models", Information Systems, 2015. AbstractWebsite

Goal-oriented Requirements Engineering approaches have become popular in the Requirements Engineering community as they provide expressive modelling languages for requirements elicitation and analysis. However, as a common challenge, such approaches are still struggling when it comes to managing the accidental complexity of their models. Furthermore, those models might be incomplete, resulting in insufficient information for proper understanding and implementation. In this paper, we provide a set of metrics, which are formally specified and have tool support, to measure and analyse complexity and completeness of goal models, in particular social goal models (e.g. i⁎). Concerning complexity, the aim is to identify refactoring opportunities to improve the modularity of those models, and consequently reduce their accidental complexity. With respect to completeness, the goal is to automatically detect model incompleteness. We evaluate these metrics by applying them to a set of well-known system models from industry and academia. Our results suggest refactoring opportunities in the evaluated models, and provide a timely feedback mechanism for requirements engineers on how close they are to completing their models.