Test performance can be influenced by a person's psychological or physical state at the time of testing.
Test taker's temporary psychological or physical state. How do we account for an individual who does not get exactly the same test score every time he or she takes the test? Some possible reasons are the following: If a person takes the test again, will he or she get a similar test score, or a much different score? A test that yields similar scores for a person who repeats the test is said to measure a characteristic reliably. Test reliability Reliability refers to how dependably or consistently a test measures a characteristic. For example, an arithmetic test may help you to select qualified workers for a job that requires knowledge of arithmetic operations.The degree to which a test has these qualities is indicated by two technical properties: reliability and validity. By using the test, more effective employment decisions can be made about individuals. In other words, the test measures one or more characteristics that are important to the job. For example, a test of mental ability does in fact measure mental ability, and not some other characteristic. The test measures what it claims to measure. This means that if a person were to take the test again, the person would get a similar test score. The test measures what it claims to measure consistently or reliably. 
What makes a good test?Īn employment test is considered "good" if the following can be said about it: Use assessment tools that are appropriate for the target population. Use only assessment procedures and instruments that have been demonstrated to be valid for the specific purpose for which they are being used. Use only reliable assessment instruments and procedures.
WHAT IS VALIDITY AND RELIABILITY HOW TO
How to interpret validity information from test manuals and independent reviews. Using validity evidence from outside studies. Methods for conducting validation studies. Interpretation of reliability information from test manuals and reviews. These explanations will help you to understand reliability and validity information reported in test manuals and reviews and use that information to evaluate the suitability of a test for your use. This chapter provides a simplified explanation of these two complex ideas. You should examine these features when evaluating the suitability of the test for your use. These are the two most important features of a test. Test reliability and validity are two technical properties of a test that indicate the quality and usefulness of the test. 
Time and Attendance/Workforce ManagementĬhapter 3: Understanding Test Quality-Concepts of Reliability and Validity.Open Access This is an open access article distributed under the CC BY-NC license. The reliability value of this book (R) is 0.75, so it has fulfilled the reliability requirement. Meanwhile, based on the Grinnell's reliability instrument, a module book is considered to be reliable if the reliability value (R) is higher than 0.75. Therefore, the module book has fulfilled the validity criterion. Based on the determined criterion, instrument validity should be higher than 3.00. The results showed that the mean value obtained from the three experts in terms of the aspects of content, language and evaluation is 2.25, 3.44 and 3.58, respectively, and the overall mean value is 3.46. Two instruments were employed to test the validity and reliability of the module book. This research was conducted in State Junior High School 2 (SMPN 2) Banyumas using descriptive quantitative approach. The objective of this present research was to test the validity and reliability of a scientific-based module book according to the 2013 curriculum.
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