This research monograph describes a new approach to the measurement of thinking processes. The author begins with a discussion of the logic of thought versus the psychology of thinking. Traditionally, thinking has been defined in terms of the logical thought processes which lead to warranted conclusions. The psychological processes, on the other hand, involve the individual's perceptions, intentions and information-processing strategies. Traditional logical approaches appear to be most suitable for analysis of thinking in "formal" highly structured problem situations. Current tests of...