Determining maths and science teacher candidates' concept images about deriative subject with repertory grid technique

This resarch has been made on The Education Faculty of a city university on the North of Turkey with 5 Science, 5 Maths students who are study Primary Science and Maths Education who has beeen taken Deriative Lessons. The success of teacher condidates which attend this resarch, has been designated by lecturer and resarcher used with final test results about the subject and deriative success test. The necessary data for creating repertory grid technique have been obtained ''Graduation'' and ''Structured İnterview'' methods. The qualitative and quantitative methods have been used analysıng of grids. This research contains two students'answers analysiss who are attenden the research and results of interview. Depending on the data, the science teacher condidate think ''deriative is about speed'', The maths teacher condidate think ''deriative is grade of fonction one one point. End of this Study , repertory grid technique is success for determining personel construct about deriative subject and confounding opinions. Also, this technique is usefulto determine critical parts of subject. Keywords: Repertory grid technique, derivative, misconceptions, personal construct psychology