Validity
- It is a concept of logic. Logic is a science that teaches what are the conditions of validity of the arguments, inferences, proposition.
- Validity is therefore the best possible approximation to the "truth" that can have a proposition, an inference or conclusion .
- An instrument, a process, a sampling, a design are appropriate to help draw valid conclusions.
Reliability
- It is the property whereby a tool applied to the same phenomena, under the same conditions, yields consistent results.
- Reliability is a necessary, but not sufficient for the validity of an instrument.
- It is a measure for determining stability and internal consistency of the instrument
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