Modelling Interacting Web Usability Criteria through Fuzzy Measures

Usability is a multifaceted concept that is usually evaluated in terms of a number of aspects or attributes that are not independent but interacting, due to their correlation or to concrete, context-specific design interests. In consequence, the aggregation of partial scores should be carried out by devices that are able of taking into account these interactions in the resulting overall score. In this paper, we describe how fuzzy measures can be used and evaluated as models of a number of the interactions between usability aspects in evaluation processes. It is also described how they can be subsequently used to obtain more realistic final scores by using aggregation operators that are based on that measures, like the Choquet integral.