The important role played by optimum stimulation level (OSL) in a variety of consumer behaviors renders it highly desirable that researchers have a short but valid instrument for measuring this construct. In this paper, a shortened (7-item) version of the Change Seeker Index (CSI) is developed and cross-validated in three countries (USA, Belgium, and the Netherlands). It is shown that the new instrument has much better psychometric properties than the original scale. Moreover, in spite of the substantial reduction of the length of the scale, the short form of CSI actually exhibits better nomological validity than the 95-item scale in two US samples.
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