Measurement is the process by which numbers or symbols are assigned to attributes of entities in the real world in such a way as to describe them according to clearly defined rules. A measure is the number or symbol assigned to an entity by this relationship to characterize an attribute.

C. Wohlin, P. Runeson, M. Höst, M. C. Ohlsson, B. Regnell, and A. Wesslén, “Experimentation in Software Engineering,” Springer, 2012. [Springer]