Musculoskeletal disorders are the second largest cause of disability worldwide. In New Zealand, the burden of musculoskeletal disorders is very high. Process evaluation studies identify and inform: the reasons and mechanisms through which non-surgical interventions work; on whom these interventions work; and how interventions can be modified, effectively implemented and successfully translated into clinical practice. This vital information can be used by stakeholders (e.g. Ministry of Health, District Health Board, clinicians and researchers) to improve treatment of patients with musculoskeletal disorders. Process evaluation studies maximize the implementation of findings from trials to clinical practice. Findings from this project will contribute to enhancing healthcare services in New Zealand.