Additional safeguards that may be included in a social and behavioral study may include

Additional safeguards may include several things to protect the rights and welfare of the subjects.
For example, when we create a study to predict the amount of people that dies because of hunger, we shouldn't just let anyone die during that study.

Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.