This present study investigates and discusses teachers' grading practice, more closely their interpretation of the quality descriptors (sv: värde- och progressionsord) in the knowledge requirements for English course 6. The aim and purpose are to identify what influences teachers' assessment and what role the quality descriptors play.

Through semi-structured interviews with five teachers, at upper secondary schools, data have been collected and analyzed using the approach of thematic analysis. The results displayed influences on teachers' assessment through four recurring themes: Experience, Instinct, Coassessment, and A Challenging Endeavour. The prominent themes of this study are argued to be linked to teachers' years of experience, time, and theoretical approach