This monograph describes in detail how a Personalized System of Instruction (PSI), or Keller Plan, approach was implemented in a large statistics course at Massey University, New Zealand. Some of the strengths and weaknesses of the scheme are explored and possible extensions noted. Major areas covered are subject area (statistics), logistics, quality of learning, bonuses, and objections. Findings suggest that PSI was well received and, although considerable effort is needed to set up such a course, it provides an effective learning situation. (Author/DAG)