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The purpose of this article is to present the clinician and researcher with a contemporary 8-stage framework for measurement scale development based on a mixed-methods qualitative and quantitative approach. Core concepts related to item response theory are presented. Qualitative methods are described to conceptualize scale constructs; obtain patient, family, and other stakeholder perspectives; and develop item pools. Item response theory statistical methodologies are presented, including approaches for testing the assumptions of unidimensionality, local independence, monotonicity, and indices of model fit. Lastly, challenges faced by scale developers in implementing these methodologies are discussed.

Bishop MD, Romero S, Patterson TS, Singletary FF, Light K. Exploration of Patient-Centered Success Criteria and Clinically Measured Improvement During Falls Rehabilitation. J Geriatr Phys Ther. 2012.

Velozo, C.A., Seel, R.T., Magasi, S., Heinemann, A.W., Romero, S. 2012. Improving measurement methods in rehabilitation: core concepts and recommendations for scale development. Archives of Physical Medicine and Rehabilitation, 93(8), Suppl 2.

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