Replication by Robert E. Slavin

Replication
Robert E. Slavin
The holy grail of science is replication. If a finding cannot be repeated, then it did not happen in the first place. There is a reason that the humor journal in the hard sciences is called the Journal of Irreproducible Results. For scientists, results that are irreproducible are inherently laughable, therefore funny. In many hard science experiments, replication is pretty much guaranteed. If you heat an iron bar, it gets longer. If you cross parents with the same recessive gene, one quarter of their progeny will express the recessive trait (think blue eyes).

In educational research, we care about replication just as much as our colleagues in the lab coats across campus. However, when we're talking about evaluating instructional programs and practices, replication is a lot harder, because students and schools differ. 

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