Andrew Davenport: I am also a graduate of speech and language pathology, which I found invaluable when 'designing' the language of the Teletubbies based on features of the emerging speech of a young child. Teletubbies is aimed for children at critical stages of language development, so the programme concentrates on music, rhythms, temporal and spatial relations, as well as real children talking in their own words about their own experiences. This is what we found children enjoyed watching. We did not consult any language specialists, but have met many since the programme aired. I am not aware of any objective studies of the benefits of the programme with regard to speech and language development, though we do hear very positive anecdotal reports from parents and carers, notably of children affected by autism. Sheffield Hallam University conducted a study based on use of the Teletubbies in a classroom situation. The findings were published in 1999.