E-LEARNING USABILITY: A LEARNER-ADAPTED APPROACH BASED ON THE EVALUATION OF LEANER'S PREFERENCES

E-learning usability is a goal of the user - centred e- learning design. Its achievement depends on the determination of the requirements, characteristics and preferences of the users of an e-learning system or environment (learner, teacher and administrator of an educational process). This paper presents different aspects of e-learning usability. One of them requires an evaluation of learner's preferences that determines the individual learning style of a learner. The results of this evaluation are necessary for learner modeling. The learner model has to influence the teacher activity in process of producing learning resources in harmony with the learning style of the learner. It is obviously that the determination of learner' preferences is an element of the adaptation technique that ensures the development of an adaptive e-learning environment. The creation of an adaptive e-learning environment depends on the technique of learner's preferences evaluation. This paper presents an approach to evaluation of human's preferences. The mathematical formulation of this approach serves for basis of tool development. A usage of this tool in the evaluation of learner's preferences is illustrated..