Abstract
This study measured Protestant Christians' beliefs about mental illness using the Beliefs Toward Mental Illness Scale (BMI). This study used a state-of-the-art item response theory technique, namely the Rasch rating scale model (RRSM), to evaluate the psychometric properties of the BMI and to produce a ruler of the construct hierarchy. Using Messick's framework for evaluating construct validity, sufficient evidence was obtained that suggests the BMI is psychometrically sound regarding substantive, content, structural, and generalizable aspects of validity. The BMI is a psychometrically sound instrument that is appropriate for measuring beliefs toward mental illness.
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