We sketch a framework for the construction of evaluation systems for web sites. It is an iterative process consisting of the construction of a model, i.e. an enumeration of properties of web sites, its testing, the identification of normative criteria that the properties of web sites must satisfy for a web site to be user friendly and a test of the criteria. We also describe briefly our own experience in constructing evaluation systems based on a large number of evaluations of web sites.

In: Proceedings from IADIS 2004, Madrid, Spain