What is the relationship between oral dyspraxia, verbal dyspraxia and generalised dyspraxia?

In any individual child it is possible for these conditions to occur in isolation or in combinations. However, when they do co-occur, they do not necessarily do so to equal severity. In addition, although there may be co-occurring motor and/or speech features, they may not necessarily be dypraxia. For example, some children with generalised dyspraxia have immature or delayed speech development. However, their motor co-ordination difficulties stand out as their main area of difficulty and their speech difficulties would not match the profile expected in verbal dyspraxia. For other children, their main area of difficulty is with speech production, rendering their speech unintelligible, but they may also have some minor motor co-ordination difficulties.