A system for developing and using systemic grammars for generation and analysis. The Sentence Generation component of this system generates single sentences from a semantic input. This semantic input could be supplied by a human user. Alternatively, the semantic input can be generated as the output of a multi-sentential text generation system, allowing such a system to use the WAG system as its realisation component. The sentence generator can thus be treated a black-box unit. Taking this approach, the designer of the multi-sentential generation system can focus on multi-sentential concerns without worrying about sentential issues.