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Group variability, scoring reliability, test length, and item difficulty all affect test score reliability; discuss how each of these variables impact test design and how you might mitigate those impacts.Group variability, scoring reliability, test length and item difficulty all play a major role in score reliability. Each one of these attributions can help with your test designs. They can all help in showing you ways to improve your tests and make them more effective. “The larger the group, the more differences in ability and knowledge each student will have” (Kubiszyn & Borich, 2016). What makes a good test, it is the reliability of the test. A student can take this test several times and the score will not change. Then the question we need to ask ourselves when deciding how we should layout the test we create.The scoring reliability is another key to testing, all these factors are essential, having a valid scoring system is a must. If the system is not reliable then the entire test may be in jeopardy.