Some scientists have criticized the concept of operational definitions as being too strict stating that a single operational definition could not completely define the meaning of a term. What has been proposed to overcome this criticism?

One of the most famous examples of case study research was conducted by

A) Alfred Russel Wallace. B) Lowell Thomas. C) Sigmund Freud. D) Charles Darwin.

A type of design in which a single group of participants is measured several times both before and after some manipulation is termed

A) an interrupted time-series design. B) an interrupted manipulation design. C) a nonequivalent control-group design. D) a longitudinal design.