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On the issue of validity

Assessment is a continuous process in the sphere of education. It has high stake influence on the future development of education. That’,s why the preciseness and fairness of assessment have become important factors. Mistakes in assessment, especially systematic errors, have bad impact on the students’, performance particularly and on the assessment system in general.The notion of validity is a valuable means for avoiding systematic errors in assessment. Use of validity as an important theoretical concept in the educational assessment process will give a chance to apply the assessment tools more correctly.The importance of any theoretical concept is measured according to the extent its application helps to improve the quality of education. The effect of validity will become greater, in case it is possible to give a quantitative expression to it. This is the aim of this paper in which an attempt is made to prove the possibility of giving quantitative expression to the validity of a test. ,Key words: validity, quality, quantity, practical, weight.

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