1. Evaluation and design are very closely integrated in
    user-centered design.
  2. Some of the same techniques are used in evaluation as in the
    activity of establishing requirements and identifying users’ needs,
    but they are used differently (e.g., interviews and
    questionnaires, etc.).
  3. Triangulation involves using combinations of techniques in
    concert to get different perspectives or to examine data in
    different ways.
  4. Dealing with constraints, such as gaining access to users or
    accommodating users’ routines, is an important skill for
    evaluators to develop.

From: Preece, J., Rogers, Y., Sharp, H. (2002), Interaction Design: Beyond Human-Computer Interaction, New York: Wiley, p. 337

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