The therapeutic alliance has long been recognized as a central component of clinical work with adults, adolescents and children. Process research with adults has repeatedly demonstrated a robust association between measures of the alliance and outcomes in therapy, and research findings have coalesced around a central concept of an alliance. However, work with children and adolescents does not have the same breadth of investigation and its conceptual description has long relied upon adult models to guide clinical work and research endeavours. This paper presents findings from a qualitative study, informed by grounded theory, which explores children's experiences of their therapeutic relationship with a counsellor. Children's responses led to the development of The Child Alliance Process Theory, and is presented as a clinical template to help guide the development of a therapeutic alliance with children.