Content validity◦ Expert must evaluate the questionnaire whether it can measure all of the constructs to show that the questionnaire has good content validity Face validity◦ Expert must look over the question whether or not itbelongs to the construct being measured Ex. The concept of healthiness has 3 constructs (physical, mental and social), but the questionnaire has only the question to ask about physical health. It means that this questionnaire has face validity, but it does not have the content validity.