Primary school educators in South Africa often experience difficulties in applying recommended adaptive assessment methods in large multilingual classes, with these challenges being exacerbated when teaching and assessing English as First Additional Language (EFAL). In this article, we report on a study that explored Grade 6 educators' knowledge and use of adaptive assessment methods when teaching EFAL. The national Policy on Screening, Identification, Assessment and Support ([SIAS] Department of Basic Education [DBE], Republic of South Africa [RSA], 2014) underpins our study as a theoretical framework. We followed a qualitative research approach to examine the knowledge as well as the classroom practices of 6 purposively selected educators who taught EFAL. The study was grounded in the interpretivist paradigm and investigated educators' lived experiences integrating adaptive assessment procedures into the teaching of EFAL in Grade 6 inclusive classrooms. We relied on semi-structured interviews, observation, and document analysis to collect data and performed thematic analysis to identify, analyse and report repeated patterns. The findings from our study indicate that the participating educators perceived their training in inclusive education and their use of adaptive assessment methods as inadequate, especially in the context of large, under-resourced classrooms. As a result, we recommend that educators should receive the necessary support from the school-based support teams and the district-based support teams to use adaptive assessment methods when teaching EFAL.