The most important characteristic of a test is its validity. Validity is the responsibility of the test constructor and the test user because validity refers to the use or interpretation that is made of a test score. There are three main points to consider in determining whether or not a test is valid. First, is there a relationship between the test content and the proposed interpretation? Secondly, is there empiric or criterion –related evidence between the test scores with other variables eg. Educational/course outcomes and finally, does construct-related evidence come from the correspondence of the test scores to deductions from established theories. ( Thorndike, R. 2004). For this assignment, carry out an extensive web search on validity and reliability in educational test development. Write a summary report on your findings. Identify some of the blatant reasons why a test may be deemed invalid. Comment on the following: “The classroom teacher is the only person who can judge the validity of a standardized achievement test for his or her class”. Discuss some factors that may result in variations in reliability estimates.
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