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The risk involved in research has been categorized and described elaborately as “less than minimal risk,”“minimal risk,”“low risk” and “high risk” whereas, in the 2006 edition, only the minimal risk category had been defined. Some of the other newer inclusions are the necessity of the researcher to administer a “test of understanding” particularly for sensitive studies, the requirement of partner/spouse to give additional consent in some types of studies and to get consent from another member of a family (secondary participants) in genetic research.