An Analysis of Teachers’ Grammatical Errors in Composing Summative Assessment

English is a challenging topic for Indonesian students since the language so different from and one of topics in grammar. However, sometimes learners make grammatical errors teachers are not an exception. This research focuses on categories found summative assessment composed by MGMP Boalemo their perceptions regarding said error. study employed descriptive qualitative method utilized document interview to collect data. The techniques data analysis thematic analysis. After conducting this research, it that most committed error participant omission, specifically omission parts speech caused mainly lack quality control among teachers. intended develop teaching, improving comprehension.