In some disciplines (e.g., psychology or political science), a 'true experiment' is a method of social research in which there are two kinds of variables.
Dǎɣ issaɣritan iyad (sund,aləmadat meɣ timusnawen fulatiktan), "tirma tadutet"taqal tamkare ən umaɣ ertayan dǎɣ ihan assin iritan ən ishanzitan.