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This study examined the constellation of interaction structures – repetitive patterns of interactions between patient and therapist over the course of treatment – that emerged in the psychodynamic therapy (PDT) of a child diagnosed with borderline personality disorder and treated by two doctoral student therapists. Identification of these interaction structures can inform therapists of what might be expected from patients with particular symptom or behaviour patterns and how interactions change over time. This study also examined each session’s adherence to three session prototypes: PDT, cognitive-behavioural therapy (CBT) and reflective functioning (RF) process. The Child Psychotherapy Q-Set (CPQ) is a 100-item instrument that assesses the processes within a single psychotherapy session. Items reflect a wide range of therapist attitudes and behaviours, patient attitudes and behaviours and interactions between therapist and patient. Experts used the CPQ to define PDT, CBT and RF process session prototypes. The results suggested that four distinct interaction structures could be identified and that their constellations differed between the two therapists and also differed over time within each treatment. Therapists were more structured and accommodating early on in their treatments and more interpretive later. Prototypical PDT process was more prominent in the sessions than RF process, which in turn was more prominent than CBT process. Unique therapeutic processes are at work in every dyad, despite holding the patient and theoretical orientation constant. An effective treatment in one dyad might not work in another due to therapist-specific and dyad-specific effects.