Even though the theory is well developed, it develops even more common. The theory has been used to show why people join groups who really want things to happen (activist groups), to organize the external (real, actual) and internal (perceived) parts (dimensions) of problem recognition, and to learn whether information that is used in information processing (processed information) can create publics. Also, some more research was done on the internal and external dimensions of problem recognition, constraint recognition, and level of involvement (Grunig & Hon, 1988; Grunig, 1997). The research is about whether the ideas are internal or external. The research shows that if the concepts are internal, they can be changed by communication, and that if they are external, then the holdable things that are around the person need to be changed in order for the person's concept of the variables to change (Grunig, 1997, p. 25). But, there is a small amount of research on the internal and external dimensions of the three key concepts, so there can be more studies on these concepts (Grunig, 1997). Then, in 2011, Jeong-Nam Kim and Grunig extended the theory to the situational theory of problem solving.