Although there had been a lot of increased awareness regarding the psychological tests, to be incorporated for the recruitment and selection purposes, there are industries that are still doubtful about the standardization techniques undertaken in the construction of these tests. One genuine way of convincing the organizational heads is, to explain them thoroughly the features of a scientific psychological test. It is quite legitimate for them to be concerned about the measures undertaken in the test.
Here is a detailed discussion on the five major characteristics, which a scientifically sound test possesses.
- A test must be objective that is it should be totally free of the subjective element. This means that, there should be objectivity of test items and objectivity of the scoring system. There should be a complete interpersonal agreement among the test experts, concerning the meaning of the items and scoring procedure. Objectivity of test items mean the same will have an uniform order of presentation, and objectivity of scoring means that, the scoring method of the test should be standardized. This will maintain complete uniformity and would ascertain that same scores are obtained when different experts score them, at different times.
- For a test to be strong, the next prerequisite is validity. Validity indicates the extent to which the test measures what it intends to measure, when compared with other outside independent criteria. However the criteria must be independent and it should be regarded as the best index of trait or ability being measured by the test. Usually validity of a test depends upon the reliability. A test that yields inconsistent results, which is a sign of poor reliability is unexpected to correlate with any external, independent criteria.
- A test should be reliable which refers to the self-correlation of the test. This means that results obtained in the test is consistent with the results, when the same is administered more than once on the same sample with a reasonable time gap. It is a note to all the organizations and industries that the online aptitude test for career selection is high on both temporal as well as internal consistency. If the test results obtained in single administration is consistent then the internal consistency is found to be high, and if the results obtained by testing and retesting are consistent then it is said that the temporal consistency is high for that particular test. So in order to be reliable the scores obtained in a test should be free from any internal defects of standardization, which generally produces errors of measurement.
- A standardized test should follow the age, grade, percentile and standard score norms. Norms hint at the average performance of a representative sample on a given test. Norms also help in interpretation of test scores.
- A test must be practicable from the point of view of time taken in its completion, scoring, length etc. In short a test should not be lengthy, and scoring methods must be easy.