This can provide for the basis of an advantageous play therapy sessions. It allows for background information to be obtained, too, which is completely necessary if the therapy is going to work. Grieving losses in a family and low self-esteem are often reasons why children are in therapy, too, so it's important for the therapist to have a good grasp of these two particular problems that children suffer with.
The therapy will also only be advantageous if the therapist is able to pay attention to the personality of the child, and get them to respond in accordance to their personality. By getting to know the child the therapist will be able to effectively implement therapy types and techniques for the benefit of the child. This is the basis of advantageous support and therapy and the biggest reason why play therapy fails is because the therapists do not take enough things into account when dealing with children who have problems - no matter what those problems actually are.