Kroll considers the last phase to be the systematic integration phase. A differentiation and integration between the child's speaking and writing can be seen in this phase. This means that speaking and writing have 'well-articulated forms and functions'; however, they are also integrated in the sense that they use the same system. As a result of the individual being aware of the audience, context and reason they are communicating, both written and spoken language are able to overlap and take several forms at this stage.