ABSTRACT
In reviews of the concept of specific developmental dyslexia, Singleton (1975, 1976) argued that research in the area was in a state of conceptual and methodological disarray. He pointed to the existence of confusion resulting from vague and idiosyncratic diagnostic criteria, to the unreliable figures of incidence, to confusion as to whether it is a unitary condition, and to the existing understanding of aetiology being based upon guesses, speculation and tenuously related findings. However, in later articles (1987, 1988) Singleton argued that recent neuropsychological research was enabling the development of more robust and sophisticated models of the reading process.
