Verifying the validity of the questionnaire depends on the availability of an external standard, or an independent measure that deals with the same variables. The simplest definition of validity is that the test actually measures what it is supposed to measure. One of the common misconceptions is that a test is true or false. The test is not true in itself, but rather it is true with respect to a particular target or a particular group. A criterion is a standard by which we judge or perform a test, and it may be a set of scores, grades, or measures that the test is designed to predict or correlate with as a measure of its validity. The criterion is an objective scale whose validity has been verified, so we compare it with the new scale to verify the degree of sincerity of that scale through the correlation coefficient between them. And experimental validity depends on finding the correlation coefficient between the new test and another test whose validity or criterion has previously been proven