Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

This paper reviews some of the methodological issues involved in the design of a randomized controlled trial currently underway in Bristol. The trial compares the progress of preschool children randomly allocated to a 'watching-waiting' control group with the experimental group who have immediate access to therapy. This paper reviews a number of relevant studies, which have either followed up preschool children with early language delays or have investigated the effects of therapy with this age group. The basic design of the trial is outlined along with a discussion of the sample, the measurements used and the therapy given.

Original publication




Journal article


Child: care, health and development

Publication Date





141 - 155


Frenchay Speech and Language Therapy Research Unit, Frenchay Hospital, Bristol, UK.


Humans, Language Disorders, Speech Disorders, Language Therapy, Speech Therapy, Follow-Up Studies, Program Evaluation, Child, Preschool, Infant, Evaluation Studies as Topic, Randomized Controlled Trials as Topic