At present, the more efficacious therapy is that delivered by speech and language therapists or speech and language therapy assistants to children individually or in groups. This may be related to more faithful adherence to the interventions schedule, and to a probably greater amount of language-learning activity undertaken. Intervention delivered via school-based 'consultancy' approaches in schools will require to be carefully monitored by schools and SLT services.

The construction and use of a therapy manual allowed the provision of replicable therapy within the research project whilst maintaining flexibility.

The study suggests a variety of factors that have to be carefully managed if SLTs are to work competently through assistants.