<P> Lasswell was a "behavioral revolution" proponent . Lasswell was credited with being the founder of the field of political psychology and was the man at which the concepts of psychology and political science intersected . By utilizing psychoanalytic biographies of political leaders, he expanded the base from which potential evidence could be garnered . The benefit of this contribution is that he was able to engage in another method of research--content analysis . By being able to use preexisting data, he was in a position to show that his work was not purely positivist but also stepped into the realm of interpretivist as well--helping him to come together in studies of personality and culture in tandem with his political behavior research . </P> <P> Content analysis is the "investigation of communication messages by categorizing message content into classifications in order to measure certain variables" While the data existed to Lasswell in the form of analyzing the messages that Allied and Axis armies disseminated within warfare, it may not have been the most accurate of methodologies for analyzing the data . "Content analysts usually seeks to infer the effects of the messages that they have analyzed, although actual data about such communication effects are seldom available to the content analyst" While Lasswell was able to perform this particular type of analysis, the weakness to this was that Lasswell could not verify his data due to communication effects not actually being available . This is because content analysis cannot study effects . While this was a weakness, he did develop content analysis as a communication tool that is still utilized today </P> <P> Leo Rosten included an appreciation of him in "People I have loved, known or admired". </P> <P> Lasswell made these contributions to the field of communication study: </P>

Who said political science investigates the phenomenon of government