Grade 12 students participated in a study that looks to answer the question" does use of self-assessment skills as teaching technique improve student the quality of individual achievement and performance and their attitudes in grade 12 science courses in our schools? Attitudes were measured with a Likert Scale survey "Questionnaire"; while achievement was measured with pre-posttest. The unit included in this study is " Chemical Calculations of the Elements" which is one of the most difficult subjects for the students. The main sources of information were teachers and grade 12 student's book. Students took both a unit test and Likert scale following the instructional period. The results show that using self-assessment skills enhanced and improve the test scores. The Likert scale survey shows that students in the first group like the way of using self-assessment skills and enjoy it. In contrast, the second group which subjected to the traditional way did not like it. Keywords: self-assessment skills, individual performance, quality, schools. DOI: 10.7176/JPCR/55-07 Publication date:November 30th 202
