چکیده (انگلیسی):

This paper is based on the construction and evaluation of reliability and validity of reasoning ability test at secondary
school students. In this paper an attempt was made to evaluate validity, reliability and to determine the appropriate
standards to interpret the results of reasoning ability test. The test includes 45 items to measure six types of
reasoning in one hundred and ten secondary school students. Content validity was evaluated by more than 25 experts
and validity was calculated by correlation between the score of each dimension and total score of the test. To know
the discrimination validity for each dimension of the test, ‘t’ test for two independent samples was used (high group
and low group). The reliability of the test was tested by calculating Alpha Cronbach. To identify those students who
are competent or incompetent in the reasoning ability percentiles were used to determine the adequate cutoff score
for the test. Overall it is concluded that the test has good construct and discrimination validity. Moreover, all the
values of reliability coefficient for each dimension are highly significant.