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A between-groups design is an experimental design in which different groups are assigned to the different conditions in the experiment. That is, the individuals who comprise a control group will be different people from those in an experimental group. The point of the study then is to examine any observed differences between the groups.
A within-subjects design is one in which the same individuals participate in all of the experimental conditions that is, repeated measures are taken from the same people, hence differences are examined within the subjects.