Within Group Design: A type of experimental design where one looks at changes in behavior across treatments. For example, a rat may press a bar for food in one series, and on the next series get shocked, and return to 'food' and 'shock' treatments. The experimenter would thus note how the rat would persevere over treatments. Within group designs can also be applied to groups of subjects. For example, in one series, Germans may invade France, and in the next series American would invade Germany, with both 'invade' and 'counter-invade' scenarios repeating. Only time and Nato however prevented this clever experiment from repeating ad infinitum (see between group design)
