In the Fourth Edition of Scale Development, Robert F. DeVellis demystifies measurement by emphasizing a logical rather than strictly mathematical understanding

The global development community is teeming with different ideas and interventions to improve the lives of the world's poorest people. Whether these succeed in

Scientific research uses concepts (or constructs) and requires means to measure them. Often latent, abstract and not directly observable, these concepts demand

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'Scale Development' guides the reader toward the identification of the latent variable, the generation of an item pool, the format for measurement & the optimiz