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The Lord Selkirk School Division #11 (Selkirk, Manitoba, Canada) had a kindergarten early admission policy in place for well over two decades. Thus, educators there had an opportunity to monitor and rate the progress of early entrants for 24 years. In each four-year block for students admitted from 1970 through 1990, performance improved over time. Specifically, an analysis of the longitudinal data indicates that early entrants received significantly higher ratings after their grade 5 year than they did at the end of kindergarten.
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McCluskey et al. (1997) studied this question.
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