We report on an exploratory evaluation that com-bines static analysis with formal concept analysis to investigate complexity issues in source code produced as part of a mandatory course in computer science. Our dataset includes over 500 Python and Java projects that represent student solutions to four semesters worth of programming assignments. We employ the latest version of SonarQube configured to use an extended set of analysis rules and focus on code complexity issues, which are known to impact code readability and maintainability. We study the distribution and composition of these complexity issues and employ formal concept analysis to study the relation between them and other issue types. We present the results of a comparative evaluation regarding the distribution of code complexity issues between Python and Java. Our most important results are synthesized in a series of remarks to help practitioners and educators allay complexity issues in junior developer code, as well as assist the latter in improving their coding skills. Finally, the dataset and SonarQube configuration are available in the form of an open data package that enables replicating or extending our work.

Users behavioral patterns are one of the main research directions in web usage mining. Web based educational systems are particularly interesting since behavioral patterns are closely related to educational performance. In this paper we focus on attractors in web based educational systems, i.e., qualitative specific behavioral patterns to which users adhere over time. The research has been conducted on a locally developed e-learning platform called PULSE. Data gathered from weblogs have been preprocessed and conceptual landscapes of knowledge have been built using Formal Concept Analysis. Users behavioral patterns have been detected herefrom, or by moving ahead a triadic view. Triadic concepts enabled us to detect unstructured attractors, while conceptual hierarchies and triadic concept sets made possible to investigate the educational attractors and to derive valuable knowledge about bundle of users and their behavior related to their educational performance.