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Improving validity of test items through credible and robust trial testing exercise: Neco approach

The underlying concept of whether an item, is testing what is supposed to test and does the item satisfy the constructor yearning , underscores the treatise of validity of test item, individual and examining body tend to adopt the most convenient and universally accepted method in ensuring validity of test items ,National Examinations Council, Nigeria over the years conduct trial testing of her test items which a view of establishing the difficulty index, discriminating index, reliability and validity of test items.this exercise integrate psychometric ingredients of test items, present a standardized item ,structured in multiple choice form to ensure robust content coverage, the security network through which this sensitive materials passes is more tight than the normal examinations ,of course the supervision of the exercise is solely the responsibility of the examining body to the extend that the selected schools are not permitted to have access to the items before ,during and after the exercise.Since the guiding principles of improving validity such as (a)reliable measurement of each facet through the use of multiple ,alternate form item, (b)accurate articulation of facets within and between content domain, (c) examination of incremental validity ,(d)empirical examination of whether there is a broad construct or combination of separate construct,( e)use of items that represent single facets rather than combination of facets the trial testing exercise conducted by the national examinations council satisfies these traits.This paper diligently looked at the procedure, process, pattern, personality, prospect and problems of trial testing in Nigeria schools with the view of establishing the relevance of trial testing for the improvement of validity and reliability of a test item in assessment industry.

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