Unit or Component testing

This type of testing is used by TTS developers to help them improve specific aspects or components of the system they are working on [516]. Each system will of course have its own set of components and hence we can t provide a single exhaustive testing framework that will encompass all systems. We can, however, identify several important areas in which testing can take place. 

The situation is more difficult in cases in which there is more than one correct answer. This arises in verbalisation, where for example there are many possible ways of converting 3 15 into words, for example three fifteen or a quarter past three. One way of handling this is to mark all the possible outputs for a test sentence. This can prove impractical, so an altemative is to have the output assessed five by a developer or test subject to see whether the output is acceptable. 

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