The Smith family has come to therapy because their teen daughter is anorexic. The father states that she is "hard to manage" and that most of the time she "refused to talk." The mother says that they only came to therapy because their doctor insisted upon it, and she doesn't see anything wrong with "a girl just trying to be thin and pretty." The mother herself is overweight. The daughter is quiet during the session and plays with her phone the whole time. The therapist asks them to "talk to each other the way you do at home," which results in a fight between the parents and the girl quietly crying. What evaluation technique is the therapist using and why?