The theme of the essential activity of the mind provided the exciting intellectual setting that made a compelling case for psychology’s founding, and also gave rise to competing models of psychology. Structural or content psychology, championed by Wundt and Titchener, defined psychology as the experimental study of the data of immediate experience through the method of trained introspection. This natural science model sought to reduce the contents of consciousness to constituent elements of sensory origin. The restricted definition and ambiguous methodology led to challenges. Nevertheless, structural psychology secured recognition of psychology as a science, and Müller, Hering, and Ebbinghaus, attempted to modify structural psychology. Additionally, Mach and Avenarius bolstered the justification for psychology as a natural science. An alternative, described as a human science model, proposed more open definition and methodologies. Brentano’s act psychology stated that the phenomenological processes of psychological events are inseparable from the environment and consciousness. The works of Stumpf, Külpe, Dilthey and Bergson all fall into the human science model, but the lack of systematic theory reduced their successful competition with structural psychology. In many respects, the “founding” of modern psychology was a false beginning, and neither model established a lasting framework for psychology.