The growing importance of the networked environment and the consequent change in users' information behaviour has challenged the library academia and professionals' skills to find new and more adequate strategies and methods to assess the performance of traditional, hybrid or digital information services. This paper aims to detail the strategy and methodology used by a research team to evaluate the performance of the Portuguese Digital Library consortium. Using a holistic user/stakeholder-centred approach, the researchers designed a Digital Library Integrated Evaluation Model. The five key-component of this model are presented: (a) Diagnosis; (b) Strategical groups and performance information needs; (c) Perspectives on performance evaluation; (d) Evaluation criteria and methods; (e) Evaluation points of view. The evaluation methods, techniques and tools developed under two of the Model components - (c) Perspectives on performance evaluation and (d) Evaluation criteria and methods - are particularly discussed: • the Digital Library Balanced Scorecard; • the Matrix of Perspectives and Strategical Measurement Areas and the related performance measures and indicators; • the Digital Library Service Quality Model and the multiple-item scale used in the assessment process. The case study is also used to explore potential interactions between evaluation cultures/environments and learning professional skills, with emphasis on benchmarking and other interesting perspectives for researc

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