Since these microsystem factors are in direct interaction with the individual, they also have the possibility of interacting with each other. This interaction is considered another level of the shell called the mesosystem. This interaction could be activities at church affected by activities in the neighborhood. Parents or other family members can affect or are affected by different activities at school.Exosystem. The next level or system of the model is the parts of the exosystem of the model that do not interact with the individual but will affect systems and cause factors that affect the individual. In the examples listed above, these exosystemic factors can cause forces that can shape family attitudes, affect peers, force changes in the school, church, or neighborhood. Macrosystem. The macrosystem is the outermost shell of the model that shapes the exosystem. These broad forces include the culture, values, structures and institutions that create the environment in which the exosystem functions..