The informativeness of the biofluid relies on the fidelity of the channel. The judges were asked to rate the original sentence on informativeness. Thus, high cue validity expresses high feature "informativeness". The reviewer appreciated the book's informativeness, however. "Informativeness" is the property of having more meaning or properties than any individual component. Egon Brunswik defined the term "ecological validity" in the 1940s to describe a cue's informativeness.