But in truth scientific psychology does not deal in natural objects. It deals in test scores, rating scales, response distributions, serial lists, and innumerable other items that the investigator does not find but constructs with great care. Whatever guesses are made about the natural world are totally constrained by this world of artifacts. (p. 2)
Danziger, K. (1990). Constructing the subject: Historical origins of psychological research. Cambridge, UK: Cambridge University Press.