As psychotherapy has developed, different styles which historically diverged began to be taught together.
In this dialogue, practitioners began to develop methods and ways of working which would take advantage of this dialogue. This style of therapy became known as integrative.
It is likely that a practitioner will have a core model, for instance, psychodynamic or humanistic, but draw upon the ideas of other models, which help them think about the work. Most practitioners adopt some form of integration in their practice, particularly if they have practised for a long time and trained continually as they have developed and the field has changed.