To achieve communicative competence should be the objective when native and non-native speakers learn English. Orthography and grammar rules are of limited importance in comparison to the strategies that are required in order to communicate adequately in our society. We can produce a text with perfect orthography and grammar, but confusing and inadequate. Different situations and everyday activities are spontaneous and unpredictable, and communicative competence enables us to be successful in those interactions. In this case, a clear presentation of the ideas is essential. Similarly, the formulae for formal speeches, as well as the emphasis on the style of academic papers, business letters or resumes, responds to the need of achieving a communicative goal.
On the other hand, the complexity of everyday conversations makes them the ideal object of study of interactional linguistics, and the cross-linguistic integration of different language practices allows research on the shaping of interaction. Interactional linguistics investigates “the trade-off between language and interaction universals on the one hand and language –and language type–specific linguistic practices on the other”.
However, the interdisciplinary character of these approaches can cause an overlapping of concepts and objects of study, and lead to theoretical confusion, since the boundaries of interactional linguistics and sociolinguistics do not always appear so clear, and the concept of communicative competence belongs to different disciplines.