14. A method of producing a synthesized word baseform for a first word not spoken during a training session, said synthesized baseform comprising a series of models from a first set of models, each model in the first set of models representing a unit of speech, each unit of speech having a size, said method comprising the steps of: forming an intermediate word baseform of the first word, said intermediate word baseform comprising at least a second model from a second set of models, said second model having a context in the intermediate word baseform, each model in the second set representing a unit of speech different from the units of speech represented by the models of the first set of models, each unit of speech represented by the models of the second set having a size larger than the size of the largest unit of speech represented by a model of the first set; correlating the second model, in its context in the intermediate word baseform, with a first series of models from the first set of models; and replacing the second model in the intermediate word baseform with the first series of models to produce a synthesized word baseform.
14. A method of producing a synthesized word baseform for a first word not spoken during a training session, said synthesized baseform comprising a series of models from a first set of models, each model in the first set of models representing a unit of speech, each unit of speech having a size, said method comprising the steps of: forming an intermediate word baseform of the first word, said intermediate word baseform comprising at least a second model from a second set of models, said second model having a context in the intermediate word baseform, each model in the second set representing a unit of speech different from the units of speech represented by the models of the first set of models, each unit of speech represented by the models of the second set having a size larger than the size of the largest unit of speech represented by a model of the first set; correlating the second model, in its context in the intermediate word baseform, with a first series of models from the first set of models; and replacing the second model in the intermediate word baseform with the first series of models to produce a synthesized word baseform. 16. A method as claimed in claim 14, characterized in that: the intermediate word baseform comprises at least a third model from the second set of models, said third model preceding the second model in the intermediate word baseform; and the step of correlating comprises correlating the second model, when it is preceded by the third model, with a first series of models from the first set of models.