Why is triangulation important when measuring someone's personality?

What will be an ideal response?


A good answer would include the following key points:
- There are strengths and weaknesses associated with any measurement technique. For example, a self-report questionnaire might be lacking in reliability or validity, or archival sources containing a wealth of data might be inaccessible to a researcher. Physiological measures can't tap psychological processes, and projective techniques have been called into question.
- Using a variety of techniques, however, allows a researcher to triangulate on a question of interest.
- Triangulation involves using different methods to answer the same question in order to be more certain of the answer.
- If a researcher were to administer a self-report questionnaire, a set of informant ratings, and physiological measures, followed by a clinical interview, all those methods would hopefully converge (or triangulate) on the same conclusions about the person being studied.

Psychology

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