Systematic gathering of objectively perceptible facts at the time of their occurrence, for example to detect usability problems.

While a person performs a task, behaviors, events, and activities are observed and recorded. When observing, one should be as inconspicuous as possible. The test persons should ideally feel unobserved or at least comfortable. During the observation document each single action. Highlight problems and the unusual. It is an exploratory method. The pure observation and problem identification in the natural context of use is in the foreground.

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