TOTO,
we're not in Kansas anymore...

A server error occured and unexplained things are happening around us.

Omer M. AKKAS

geçerlik geçerlik nedir? 11“the soundness or appropriateness of a test or instrument in measuring what it is designed to measure”“ bir testin veya bi

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Geçerlik | Presentation by Omer M. AKKAS