The study in this report was prompted by the fact that both the 1987-88 and 1990-91 SASS estimated different numbers of teachers using the TLR compared with the school questionnaire. In the 1987-88 SASS the schools, on average, reported fewer teachers on the TLR compared to the school questionnaire. In the 1990-91 SASS, the schools reported different numbers of teachers on these two forms.
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