n this article, we outline the basic features of the strategy that Cracolice and Roth (1996) refer to: the Personalized System of Instruction (PSI), which is also known as the Keller Plan. PSI is a non-traditional method of teaching that thousands of instructors have used at colleges and universities since the 1960s. Although PSI is an effective and empirically validated method of instruction, many traditional and distance educators are unfamiliar with the system, mainly because dissemination of the method occurred during the 1970s, before an entire generation of instructors assumed their positions, and before distance learning came into prominence.
This paper provides a good overview of PSI, including it's initial development, rise to prominence, why it fell out of favor as a method and opportunities for use in online courses.
