http://www.youtube.com/watch?v=zN4YpckXdFk
The lessons under the fifth module of the course ED103 discusses about the validity and reliability of a test. Validity speaks about the appropriate means of measuring what it is to be measured. A test maybe reliable though at the same time, it could also not be valid because it does not measure what is supposed to be assessed. Content- the topic, Face- the physical aooearanceof a test, and Contruct- the fators that influences the scores ; are ways of establishing validity.
Reliability refers to the consistency of an assessment. A test is reliable if, applying the same tests to the same students, the teacher will get similar results.
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