The basic goals of phase one are to develop a working relationship and a therapeutic alliance and to determine if the level of expertise of the eye movement desensitization and reprocessing (EMDR) clinician is adequate for the complexity of the case. Other goals are to develop a comprehensive treatment plan and case formulation. EMDR therapy was developed as a form of treatment to ameliorate and heal trauma. Clinicians working with complex trauma must have substantial understanding of the adaptive information processing (AIP) model and the EMDR methodology. During phase one, the clinician works on creating an atmosphere of trust and safety so a therapeutic alliance can be formed with the child and the caregivers. This chapter shows an example of how medical issues can affect the quality of the parent-child communications. The adult attachment interview (AAI) gives us the view of the presence of the experiences in the parent’s life.