Drechsler and van Driel(2008) have fruitfully applied the story-line method for exploring experienced teachers’ PCK of teaching acid-base chemistry. They have asked experienced teachers to express their satisfaction with their teaching of this topic, at present and in the past. While the teachers drew the line, they were also asked to comment on them, explaining what had caused the direction or the change of direction. Their explanations showed a broad spectrum of PCK of teaching acids and bases. In sum, the story-line method will be attractive for teachers because the graphs are easy are to design and will be considered by them as an interesting way of becoming aware of their own PCK . Moreover, for teacher educations and researchers, the story-line method will offer an opportunity to explore changes in teachers’ PCK easily.