The speech of adults with psychotic disorders, including schizophrenia, is often abnormal. This may take the form of new words not generally understood by anyone other than the speaker and speech which is tangential and has loose associations. There is also some evidence that people with psychosis use less set phrases which are in common usage (such as 'I want to go') than healthy people. There is some evidence that children who later develop psychosis also use speech and language differently than people who do not later develop these problems, however this evidence is based on the child's parent's report of their speech and language and therefore may not be accurate. We would like to use recorded data of children actually speaking at ages 5 and 8 and code this for various measures of speech normality. If we find that the speech of children at these ages who later develop mental health problems is different from the speech of those that do not this would be a very useful finding for several professional groups, such as speech and language therapists, school teachers and mental health clinicians.