*Research that has been conducted by an independent third party
*Longitudinal research (over several years) that spans several sequential grade levels
* Research that uses a clincial model with experimental and control groups
*Research that has been replicated
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* Research that has been planned and conducted by an interested party
*Short-Term research(weeks/months) tht only uses selected grade levels
*Research that uses a model with no experimental and control groups
* Research that has not been replicated
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