ABSTRACT
This chapter aims to introduce readers to common methods that can be used to assess different sources of reliability and validity evidence. Score reliability is commonly assessed with coefficient alpha, although researchers are embracing newer statistical techniques, including composite reliability, omega, and coefficient H. The consistency of scores across time on a measurement scale is called reliability/precision. Coefficient H was designed to overcome some of the shortcomings associated with composite reliability. Researchers interested in a pilot review on the application of coefficient alpha in exercise psychology are encouraged to consult Wilson and colleagues. A review of a prominent journal in sport and exercise psychology revealed that the most commonly tested sources of validity evidence in validation research was internal structure and relations with other variables. Foundational to any claim made in sport and exercise psychology is the assurance that the measurement scales used for such a claim produce valid and reliable scores.
