Refactoring paper accepted at TSE


We are very glad to announce that the paper ““Identifying Extract Method Refactoring Opportunities based on Functional Relevance”” (by Sofia Charalampidou, Apostolos Ampatzoglou, Alexander Chatzigeorgiou, Antonios Gkortzis and Paris Avgeriou) has been accepted for publication at the IEEE Transactions on Software Engineering

Abstract—‘Extract Method’ is considered one of the most frequently applied and beneficial refactorings, since the corresponding Long Method smell is among the most common and persistent ones. Although Long Method is conceptually related to the implementation of diverse functionalities within a method, until now, this relationship has not been utilized while identifying refactoring opportunities. In this paper we introduce an approach (accompanied by a tool) that aims at identifying source code chunks that collaborate to provide a specific functionality, and propose their extraction as separate methods. The accuracy of the proposed approach has been empirically validated both in an industrial and an open-source setting. In the former case, the approach was capable of identifying functionally related statements within two industrial long methods (approx. 500 LoC each), with a recall rate of 93%. In the latter case, based on a comparative study on open-source data, our approach ranks better compared to two well-known techniques of the literature. To assist software engineers in the prioritization of the suggested refactoring opportunities the approach ranks them based on an estimate of their fitness for extraction. The provided ranking has been validated in both settings and proved to be strongly correlated with experts’ opinion

1st Prize in the “Cooperate” competition for the SE Group and Yummy Software






We are glad to announce that the Software Engineering Group together with Yummy Software have been awarded the 1st prize of the “Cooperate” competition in the context of the 2016 Technology Forum  that took place in Thessaloniki, Greece on May 18, 2016.

The prize has been awarded for the “YummyWallet” mobile app that blends the advantages of state-of-the-art payment technologies with money savings.

Paper on metrics fluctuation accepted at Information and Software Technology

We are glad to announce that our paper “Software Metrics Fluctuation: A Property for Assisting the Metric Selection Process” (E. M. Arvanitou, A. Ampatzoglou, A. Chatzigeorgiou and P. Avgeriou) has been accepted for publication at the Information and Software Technology journal.

The paper is the result of collaboration between the University of Groningen and University of Macedonia. The paper introduces the Software Metric Fluctuation (SMF) property, which quantifies the degree to which a metric score varies, due to changes occurring between successive system’s versions

Paper accepted at Information and Software Technology

We are glad to announce that our paper “Studying the Evolution of PHP Web Applications” (T. Amanatidis and A. Chatzigeorgiou) has been accepted for publication at the Information and Software Technology journal and is now available online


• We have analyzed the evolution of 30 PHP Web applications.
• First study on Lehman’s laws of software evolution for web applications.
• Laws implying continuous growth and maintenance are confirmed.
• However, laws implying increase of complexity and rapid decrease of the growth rate are not confirmed.