1-
Length of Test.
The
longer the test is, the higher its reliability will be.
2-
Spread of Scores.
The
larger the spread of score is, the higher the estimate of reliability will be.
3-
Difficulty of Test.
Too
easy or too difficult tests have low reliability.
4-
Objectivity.
The
standardized tests which are high in objectivity, have high reliability.
5- The length of the test.
6- The time limits for the tests.
7- A common set of instructions.
8- The scoring procedure of the test.
9- A common environment in which to attempt the test.
10- The difficulty of the test items. (i.e., if the
test items are too difficult than the spread of scores will be small).
11- The nature of the student group. (i.e., if the
group is quite homogeneous the reliability will be lower than if the group is
fairly heterogeneous).
12- Tests that are too easy.
13- Tests that are too hard.
14- The more questions the better reliability.
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any suggestion on my side