Undergraduate psychology education has also faced the fact that two-thirds of its graduates immediately apply for jobs in the private or public sector rather than pursuing master's studies (Norcross et al.,2016). In this context, faculty members of psychology departments deliberated at an American Psychological Association (APA) conference in2008 about the prospects of undergraduate education and recommended a core curriculum introductory psychology that encourages a better integration of students' knowledge and experience as well as allowing them to apply psychological knowledge in their own fields (Dunnetal., 2009). Sometime later, a working group of the APA Board of Educational Affairs (BEA) provided recommendations for strengthening the common core of introductory psychology. In this article, the authors propose a different kind of integration which gives special prominence to the structure of the subject matter: the mental-behavioral system.