Selecting members of a focus group first requires choosing a target community, population, or demographic which will structure the community needs assessment. This information guides the selection process for a focus group. The principle of the focus group is to select members who are diverse yet share a degree of commonality. This may sound paradoxical yet it isn't necessarily. Generally speaking the commonality between focus group members is a vested interest and stake in their community. Thus, focus group members might include: "local politicians, business owners, block club leaders and community activists. Another focus group would consist of adult resident of the community; and a third consisting of youth residents of the community".