Four factors in teaching intern effectiveness, as measured by a Praxis III-similar instrument, were found among observational data of teaching interns during the 2010 spring semester. Those factors were lesson planning, teacher/student reflection, fairness & safe environment, and professionalism/efficacy. This factor analysis was as much of a statement about effective teaching as it is about the technical aspects of an instrument utilized to assess it. Forty-one percent of effective teaching was found to be in the lesson planning.