ISSN : 1796-203X
Volume : 2    Issue : 5    Date : July 2007

A Study on the Possibility of Automatically Estimating the Confidence Value of Students’
Knowledge in Generated Conceptual Models
Diana Pérez-Marín, Enrique Alfonseca, Pilar Rodríguez, and Ismael Pascual-Nieto
Page(s): 17-26
Full Text:
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We propose a new metric to automatically evaluate the confidence that a student knows a certain
concept included in his or her conceptual model. The conceptual model is defined as a simplified
representation of the concepts and relationships among them that a student keeps in his or her
mind about an area of knowledge. Each area of knowledge comprises several topics and each
topic several concepts. Each concept can be identified by a term that the students should use. A
concept can belong to one topic or to several topics. Terms are automatically extracted from the
answers provided to an automatic and adaptive free-text scoring system using Machine Learning
techniques. In fact, the conceptual model is fully generated from the answers provided by the
students to this system. In the paper, the automatic procedure that makes it possible is reviewed in
detail. Finally, concept maps are used to graphically display the conceptual model to teachers and
students. In this way, they can instantly see which concepts have already been assimilated and
which ones should still be reviewed.

Index Terms
metrics of concept assimilation; generation of conceptual models; free-text scoring; blended
learning; e-assessment; e-learning