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2. Melchior, E.-M., & Bösser, T. (1989): User Modeling and Validation. ESPRIT Project 385 - HUFIT. Deliverable B7. 1c.
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5. Mazoyer, B. (1986): The Analysis of Tasks and Users for the Design of an I.T. Product. ESPRIT Project 385 - HUFIT. Deliverable A4. 4a.