This is a qualitative analysis that, based on systemic functional linguistics, or SFL, and genre theory, has aimed to study the genre pedagogical implications on written language as they occur in narrative stories and expositions whilst the model is introduced. Systemic functional linguistics is a linguistic theory that views the organisation of language as functional options for meaning; language is a set of resources to channel meaning through realisation. Genre theory elucidates the pragmatic and educational uses of SFL in the categorizing of language in configurations of meanings as they are set and understood in different cultures.  The purpose of the survey is to do so with focus on successful and less successful writers by attempting to answer two primal issues:

1. How is development of written language in reference to the introduction of the genre pedagogical model visible in the studied texts?
2. How does genre pedagogical teaching influence successful and less successful writers as visible in their writing with a certain purpose?

To answer these issues the survey is based on narratives and expositions written by high school students who have been divided into two groups according to the purpose of the survey. One text in each genre has been written by the students before and after lessons based on the genre pedagogical learning wheel explaining the relevant genres. Thereafter the texts have been analysed, both in accordance to the staging of the relevant genres, but also with an inductive focus on the variations of the texts.  The results show that significant development of the texts, after the genre pedagogical lessons, is visible in both student groups in different ways. This demonstrates how the genre pedagogical approach to teaching language is a method that is able to lift students regardless of their prior merits.