This conclusion presents some closing thoughts on concepts discussed in the preceding chapters of this book. The empirical study dealing with the reports of psychology practitioners, presented in the previous chapter, was designed with the goal of integrating and comparing the various theoretical aspects. The proposal of Gregory Kimble seems to fit with one pole of factor, namely the dimension emerging from cluster, dealing with the understanding of psychology as a scientific discipline prioritizing theoretical reflection over practice. Arthur Staats' psychological behaviorism seems to share some aspects emerging from cluster. Indeed, unified positivism reconnects two traditionally opposed ways of considering the object and the method of psychology, namely the objective and the subjective. Gregg Henriques' unified theory of psychology perfectly embodies the unsolved dialectics between objectivity and subjectivity or, in methodological terms, between monism and dualism. Norman Anderson's information integration theory (IIT) is openly an attempt to reconcile two traditionally opposed approaches: the nomothetic and the idiographic.