["Journal of Consumer Behaviour, Volume 25, Issue 2, Page 953-973, March 2026. ", "\nABSTRACT\nScales, serving as measurement instruments composed of carefully designed items intended to capture latent constructs, play a critical role in advancing consumer theory and marketing practice. Yet, developing and validating scales poses a formidable challenge due to the diverse methods required to ensure rigor and robustness. This article presents a clear and concise guide that addresses key aspects of the scale development and validation process. A practical framework grounded in a mixed‐method approach and illustrated through five studies serves as a reference for selecting techniques to measure complex phenomena and further advance theoretical and practical insights. These guidelines are particularly pertinent to consumer behavior and marketing research, where accurately measuring latent constructs such as consumers' beliefs, perceptions, emotions, attitudes, and intentions underpins both theoretical testing and the design of effective marketing strategies.\n"]