Research starts with an idea. The idea leads to a review of the empirical literature to understand existing philosophical and theoretical models and reported results related to that topic. The idea is then refined to identify a novel question based on theory and previous investigations. A study is born. An idea or a question is not sufficient in and of itself. Studies are multifaceted, complex undertakings that require a diverse skill set, as illustrated in the Perspectives in this issue of the journal. One of the most important parts of this process is the understanding of measurement theory.

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