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Validity
Measuring what it intended to measure
Face Validity
questions are measuring some concept or construct
Content Validity
whether questions are representative of possible items
Criterion Validity
Score of instrument relate to any external standard
Construct Validity
Whether items measure what they intend to
Reliablity
Overtime, questionnaire yields consistent results
Stability
Respondents provide same answers to same questions following a second questionnaire
consistancy
questions are strongly related and measure some concept