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...Ed trueand quasi experimental designs eric ae digest ericdevelopmentteam www gov table of contents if you re viewing this document online can click any the topics below to link directly that section true and experimentaldesignsinevaluation trueexperimentaldesigns limitationsoftrueexperimentaldesign recommendationsforevaluation additionalreading ericidentifier publication date author gribbons barry herman joan source clearinghouse on assessment evaluation washington dc aedigest thisdigestwascreatedbyeric theeducationalresources informationcenter formoreinformationabouteric contact accesseric let are especially useful in addressing questions about effectiveness impact programs emphasizing use comparative data as trueandquasi pageof ericcustomtransformations team context for interpreting findings increase our confidence observed outcomes result a given program or innovation instead function extraneous variables events example help us answer such following would adopting new integrated rea...