The system, or the design of system, should be evaluated.
When we make "evaluation" a subject, we enter the research field of "value engineering".
We consider as follows and each depends on cases : what is appropriate to be made an item of evaluation, what the criteria of each item is, how each item is evalluated (measured), how the facets of user experience are illustrated in diagram, etc.
In the case of Web-based information communication system, the followings and suchlike are typically used as indices : 'efficiency/effectiveness/productivity', 'usability (easy to use/operate)', 'functionality', 'content', 'user satisfaction'.