Achievement in the learning area of science in Zimbabwe shows significant gaps in comparison to other countries in the global south. Science achievement of bilingual learners has been discussed at different levels, including cultural responsiveness in science teaching, but the emphasis has been placed primarily on the development of science…

Even if national and international assessments are designed to be comparable, subsequent psychometric analyses often reveal differential item functioning (DIF). Central to achieving comparability is to examine the presence of DIF, and if DIF is found, to investigate its sources to ensure differentially functioning items that do not lead to bias.…