School Management System-SMS (Sistem Pengurusan Sekolah) is a system developed by Ministry of Education Malaysia in order to reduce teachers' burden and for Educational Data Integration. SMS is a type of Management Information System (MIS) and is pivotal for efficient and effective running of schools in Malaysia. As SMS is newly introduced, no research on its use could be found yet; therefore, this research is crucial in providing information to MOE on the SMS success. The core of this research is to validate the relations of variables in DeLone and MacLean IS Success Model with teachers' perception towards the SMS success. Several Information System Success (ISS) evaluation theories will be discussed in this research as they are essential to describing the IS Success. Using a quantitative approach, the tool (survey questionnaire) was applied in a survey at Sekolah Kebangsaan Puncak Alam (2), Selangor with 56 respondents. Data were analyzed using SPSS. Two types of statistical analysis were used on the collected data. Descriptive analysis was used to analyze the demographic information and correlation analysis to find the relationship between variables. We found significant relationships between variables: system quality, information quality, use, user satisfaction and individual impact. The results supported the hypotheses made to answer all the research questions. The findings are essential for MOE to know the teachers' perception in the implementation of SMS in school.