Generally speaking, you should design groups to be
- Homogeneous within a group with regard to stratifying characteristics (E.g., separate
- groups for teachers, parents, and administrators); and
- Diverse within a group with regard to other characteristics that might affect responses
- (e.g. men and women; Blacks, Hispanics, and whites; old and young; geographical and
- occupational mix; prior knowledge or attitude toward the topic).
Additionally, you should avoid:
- People who know one another; and/or
- People of extremely different rank, socioeconomic status, antagonistic viewpoints.

