Grammar Explorer surpasses the descriptive, form-focused grammars currently available, because it treats learners as active meaning-makers and puts them firmly in control of their learning experience. Within the structure of the grammar, learners are able to enter into a non-linear process of negotiation with grammatical material that requires and encourages the use of basic cognitive and meta-cognitive strategies such as inferencing, grouping and recombination. It is through this process of exploration and negotiation that the learners acquire the type of functional grammatical competence that is essential for the successful acquisition of pragmatic competence and for the development of cognitive and metacognitive skills.