This process is also a kind of group process because one may engage in several different behaviors in an attempt to control variables. In general, this skill is any attempt to isolate a single influent of a system so that it's role can be inferred. The process is an attempt to achieve a circumstance or condition in which the impact of one variable is clearly exposed. The use of experimental and control circumstances, standardizing procedures and repeated measures are only a few of the ways in which variables might be controlled.