Abstract. Research related to the identification of misconceptions has been carried out by
some researchers, notably using the CRI scale (Certainty of Response Index). But there were
no results that underline misconceptions by using a scale of honesty. This study aimed to
identify misconceptions on relations and functions at Basic Math Capita Selecta subject using
CRI and Honesty Scale. The study used survey methods, the instrument used was a
questionnaire scale CRI, honesty scale questionnaire and interview guidelines. The results
showed that: 51,32% student understand the concept; 12,63% high guess element of the correct
answer; 16,32% are misconceptions; and 19,47% did not know the concept. Based on the
results of the honesty scale which was strengthened by interviews, it is shown that students
were wrong in understanding the concept of the relation of functions for a one-to-one
correspondence between two sets, and wrong in determining the function of the graph. With
the results of this identification, enables teachers to provide reinforcement for students who
were still weak at a concept to provide a review of the material.