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Knowledge Engineering

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Membres

Kalthoum Rezgui Kalthoum Rezgui

Publications

  • 2020
    Kalthoum Rezgui, Hédia Sellemi

    A blockchain-based smart contracts platform to competency assessment and validation

    -, 2020

    Résumé

    During last years, several competency management systems (CMSs) have been proposed to support the acquisition, allocation, and improvement of competencies. However, competency information and associated proofs are still not tracked and shared in a trustworthy and immutable way. In this context, blockchain technology provides a prominent manner to keep track of competencies and achievements and to ensure their sharing in a secure and transparent manner. Particularly, given the decentralized nature of immutable and distributed ledgers enabled by blockchain, the potential for using this revolutionary new technology for lifelong competency tracking and assessment is tremendous. In this paper, a functional architecture using smart contracts and blockchain is proposed to support competency tracking and assessment in learning networks. Thus, by implementing the proposed architecture, all the different stakeholders involved can be connected, namely, learners, authors, and assessors. Besides, a full traceability of acquired proofs of competencies and competency profiles is warranted, while ensuring their authenticity and integrity.

  • Kalthoum Rezgui, Hédia Sellemi, Khaled Ghédira

    Towards a common and semantic representation of e-portfolios

    -, 2018

    Résumé

    Since the early 1980s, a paradigm shift, caused by the work undertaken in the field of cognitive psychology, has occurred. This shift is known as the move from teacher-centered instruction to learner-centered or learning-centered instruction, and emphasizes the importance of building new knowledge on previous ones, interacting with peers, making meaningful and reflective learning and being engaged in his own path to foster learning. This new vision of teaching has created a need for new learning and assessment instruments that are better adapted to these pedagogical realities. In this context, the electronic portfolio or e-portfolio is one of the most versatile and effective tools that have been proposed for this purpose. More specifically, the interest in e-portfolios has grown considerably with the emergence of the competency-based approach and portfolio-based competency assessments. The purpose of this paper is to describe a semantic-based representation of e-portfolios, defined on the basis of official e-portfolio standards and specifications. Moreover, a comparative study of several well-known e-portfolio solutions has been carried out based on different facets, such as functional features, technical and organizational features. The objective is to identify those features that are mostly supported by e-portfolio solution providers and accordingly to gain a fairly accurate idea of the common structure of e-portfolios. In addition, the authors take advantage of an already implemented ontological model describing competency-related characteristics of learners and learning objects and combine it with the e-portfolio ontology, with a view to support a more reliable and authentic competency assessment.

    Kalthoum Rezgui, Hédia Sellemi

    Modeling competencies in competency-based learning: Classification and cartography

    -, 2018

    Résumé

    Despite the importance of competency modeling for both individuals and organizations, there is a lack of a comprehensive literature review and a cartography for it. This paper aims to provide an in-depth overview of different approaches to competency modeling reported in the field of technology-enhanced com petency-based learning. This literature review is complemented by an additional overview of related initiatives toward modeling intended learning outcomes, learning opportunities, achieved learning outcome profiles of learners and competency maps. In addition, a cartography illustrating the relationships between some important models is proposed. The main purpose of this work is to provide researchers with a comprehensive review of the current status in this field as well as to highlight ongoing issues and challenges that need to be addressed.

  • Kalthoum Rezgui, Hédia Sellemi, Khaled Ghédira

    Ontology-based e-Portfolio modeling for supporting lifelong competency assessment and development

    -, 2017

    Résumé

    Over the last century, different learning theories have shaped the world of education and training before shifting to the competency-based approach (CBA). This new paradigm to teaching and learning aims to ensure that every student has to graduate with the competitive competencies of lifelong learners and is ready to enter the workforce and begin functioning in entry-level positions. However, despite the growing interest in competency-based learning and training, this field still faces numerous challenges, essentially the lack of consensus about an interoperable description of competency evidences. Indeed, the move towards CBA has created a need for effective instruments that support and assess competency development. In this context, the electronic portfolio (e-Portfolio) emerged as a suitable tool that helps learners collect and manage multiple kinds of assessment evidences linked to the program’s competencies from multiple sources. In this paper, we propose an ontology-based approach to e-portfolio modeling which relies on Semantic Web technologies to formally and semantically describe portfolio artifacts that evidence the achievement of one or several competencies. The proposed ontology is structured according to official e-Portfolio specifications, namely IMS ePortfolio and JISC Leap2A. In addition, other existing approaches to e-Portfolio modeling reported in the literature have been explored to avoid misinterpretation of these specifications. Furthermore, a comparative study of common e-Portfolio systems has been carried out in order to gain a fairly accurate idea of the generic structure of an e-Portfolio.