An ethical principle dictates that subjects of studies should be told about the nature and purpose of a study before they participate.This can be accomplished through the use of:

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Informed consent forms are the most appropriate method for informing study participants about the nature and purpose of a study and obtaining their consent to participate. Face validity refers to the extent to which a study measures what it is intended to measure and is not directly relevant to informing participants. Qualitative methods and observational designs can be used to collect data in a study, but they do not necessarily inform participants about the nature or purpose of the study.

An Ethical Principle Dictates That Subjects of Studies Should Be