The Mesosystem is the interaction between two or more microsystems, such as parents and peers.

Maxine's mother is finally getting the help she needs to manage her mental health condition. Unfortunately, managing one's own mental health takes time to master and can sometimes get worse before it gets better. Linda is having a hard time coping with the change in her schedule and feels anxious about having to get herself to her appointments on time. While at her appointments, she is divulging some challenging childhood experiences and has recently left her appointments feeling despondent. Although Linda's psychologist assures her that her mood swings will become less severe over time, she has been stuck in an extended hypomanic episode in which she feels agitated and anxious much of the time. After one of Linda's weekly appointments, she drove to Maxine's school to pick her up from early intervention summer school. Upon entering the classroom, Linda sees that Maxine's nametag on her desk has been misspelled. Immediately enraged, Linda stomps over to Maxine's teacher, Sasha, who she takes her frustrations out on. Linda yells at Sasha and expresses her distrust for this school and dissatisfaction with Sasha's teaching. After this incident, Sasha's self-esteem plummets. She feels so scared to make another mistake with Maxine that she distances herself from Maxine and Maxine's mother. Maxine and her teacher have fewer and fewer interactions over the summer and Sasha always finds other parents to talk to when Linda comes to pick up Maxine. This lack of positive connection or communication between Maxine's teacher and her mother causes Maxine's isolation from her peers to go unnoticed. You notice, however, that Maxine isn't playing with her peers at summer school like she was the last time you visited a few months ago.