This study was intended to develop a comprehensive and psychometrically adequate professional identity scale for healthcare students and professionals based on Taiwanese cultural contexts. In order to elicit a more consistent result of the psychometric indices of the newly developed scale, the study adopted a combination of exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) to examine the consistency of the scale factors. In a pilot study of 562 randomly selected healthcare students and professionals, the EFA yielded a 33-item four-factor model with the terms professional commitment & devotion (16 items; 47.33% of variance), emotional identification & belongingness (7 items; 9.72% of variance), professional goals & values (5 items; 8.17% of variance), and self-fulfillment & retention tendency (5 items; 3.38% of variance). The CFA yielded an 18-item four-factor model with good or even excellent fit to the data, where the chi(2)/df ratio = 1.138, Tucker Lewis index (TLI) = 0.997, comparative fit index (CFI) = 0.997, and root mean square of approximation (RMSEA) = 0.016. The convergent validity and discriminant validities were also conducted to test the feasibility of the Professional Identity Scale for Healthcare Students and Professionals (PIS-HSP) scale. For the EFA model, the Cronbach's alphas for the four factors and the overall scale ranged from 0.84 to 0.96; for the CFA model, the Cronbach's alphas and composite reliabilities were, respectively, in the ranges of 0.78-0.93 and 0.78-0.97, demonstrating satisfactory reliabilities. The results proved that the developed PIS-HSP can be a reliable measurement tool to assess professional identity for healthcare students and professionals.
