Child psychotherapy requires case conceptualization through the lens of developmental psychology in a multimodal approach to assessment, diagnosis, treatment planning, and clinical interventions. This chapter outlines a blueprint for therapists to provide treatment for children by integrating these fundamental principles while collaborating with the other people in the child’s life. The chapter guides the therapist through case conceptualization that integrates the most efficacious treatment interventions into the eight-phase template of eye movement desensitization and reprocessing (EMDR). Adaptive information processing (AIP) theory drives treatment with EMDR throughout the eight phases of that protocol and provides a template for case conceptualization and treatment planning. The use of the EMDR approach to psychotherapy is well documented and approved as evidence-based practice in Substance Abuse and Mental Health Administration (SAMHSA) and California Evidence-Based Clearinghouse for Child Welfare (CEBC).