Formalization of Expert Knowledge About the Usability of Web Pages Based on User Criteria Aggregation

Usability Evaluation Criteria

User evaluation criteria of the usability of web pages can be formulated in different ways, depending on the purpose of the assessment and the particular expert (Fernandez et al., 2011). Usually these criteria are divided into several groups (Dubey et al., 2012). From these criteria groups, in turn, in accordance with the logic of the expert a hierarchy can be constructed. Consider such a hierarchy and each of the criteria-user based on (Chiou et al., 2010).

In order to achieve a simple and easy viewing a web page, it must meet several criteria: first, it is clear visual hierarchy of the page for the user, which denoted by . It includes the following several components (input criteria): - the degree of “isolated” or “underline” the most important elements on the page; - assessment of the condition “if the items are part of each other logically, they should be submitted as an attachment”; - degree of relatedness visual elements that are linked logically.

Second, utilization per page established conventions, general rules will be called . A criterion consists of two input criteria: - a clear indication of the active elements; - application of the standard notation and conventions (understandable in any language).

Third, the measure of separation of the web page to crisp the field for the user to comfortably navigate in these areas will be denoted . The criteria include the following components: - application of template “search, categories, content”; - the use of reticulated layout.