Some of the results were fed back to improvements of design, “influenc [ing] the Project’s implementation goals and priorities.” The results served as a base for specifying a “partial list of requirements for new ADL interfaces that came from user evaluation studies.” User logs were also studied as a part of the evaluation. The evaluation concentrated on users and their interactions through the interface, with usability and functionality as the main criteria. The usability studies have become one of the more popular ways to approach and implement digital library evaluation (e.g., Buttenfield, 1999). But usability is only one of the possible and needed criteria and approaches.