The amount of ambiguity and uncertainty
perceived by the user is a measure of the cognitive costs to
bear when using the website.2 Literature suggests that individuals
perceive and process uncertain and ambiguous information differently,
depending on their cognitive capabilities, past experience, and
attitudes (Grisé and Gallupe, 2000; Kuhlthau and Tama, 2001;
Tversky,1972), as their cognitive and learning styleworks as a sort of
internal mechanism filtering or activating their cognitive capabilities
(Anderson, 2006). In the distributed cognition view, the
perceived uncertainty and ambiguity are not only related to the type
of task to be accomplished using the website or to the user information
processing capabilities, but also to the website features
themselves. Poor website design requests to the user a greater
attention to grasp the logic and the way the website works.