In this investigation, we produced a new 8-scale measure of perfectionism called the Perfectionism Inventory (PI) that is designed to capture the important constructs provided by 2 existing Multidimensional Perfectionism Scale (MPS; Frost, Marten, Lahart, & Rosenblate, 1990; Hewitt & Flett, 1991b) measures, along with new perfectionism scales. In the results from 3 studies, we describe scale development, scale psychometric properties, and criterion-related validity evidence for the 8 PI scales: Concern Over Mistakes, High Standards for Others, Need for Approval, Organization, Parental Pressure, Planfulness, Rumination, and Striving for Excellence. We present relationships between the 8 PI scales, relevant MPS scales, and other criterion measures. Second-order exploratory and confirmatory analyses provide support for the 8-scale PI model as well as support for 2 composite PI factors labeled Conscientious Perfectionism and Self-Evaluative Perfectionism.
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