The purpose of the study is to investigate the level of understanding of first three grade preservice teachers of the scientific and engineering practices according to next generation science standards (NGSS) at the World Islamic Sciences University. The sample of the study consisted of 154 fourth year female student teachers at International Islamic Sciences University in the academic year 2019/2020. The study administered a questionnaire containing 32 items that show the indicators of scientific and engineering practices. Its validity and reliability were checked by a committee of experts and by calculating Cronbach's Alpha coefficient which was 0.90. The findings of the study showed that the level of the student teachers' understanding of scientific and engineering practices in light of the next generation of science standards was low. The study recommended the need to reconsider the plans of the bachelor's degree class teacher and the importance of providing a science laboratory to teach scientific courses at the university.