When doing educational research we have to consider the following terminology:
Validity
Validity refers to the degree to which a study accurately reflects or assesses the specific concept that the researcher is attempting to measure. It is the best available approximation to the truth of a given proposition, inference, or conclusion.
Triangulation
a powerful technique that facilitates validation of data through cross verification from more than two sources. It is the application and combination of several research methodologies in the same study. It is used to increase the credibility and validity of the results
Reliability
Reliability is the extent to which an experiment, test, or any measuring procedure yields the same result on repeated trials. It is the "consistency" or "repeatability" of your measures which creates quality in measurement.
Generalisability
This describes the extent to which research findings can be applied to settings other than that in which they were originally tested. A study may be valid in one setting but not in another and in this case the research results would not be generalisable.
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