The Threshold Project
A major study conducted in the late 1980s into the nature of the language and learning difficulties experienced by Grade Five learners when the medium of instruction changed from mother tongue to English.
https://admin.jet.org.za/clearinghouse/projects/primted/resources/language-and-literacy-resources-repository/macdonald-1990-english-language-skills-evaluation.pdf/view
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The Threshold Project
A major study conducted in the late 1980s into the nature of the language and learning difficulties experienced by Grade Five learners when the medium of instruction changed from mother tongue to English.
Macdonald 1990 Crossing the threshold into standard three.pdf