Modern computer-based molecular modelling opens up new possibilities for chemistry teaching at different levels. This article presents a case study seeking insight into Finnish school teachers' use of computer-based molecular modelling in teaching chemistry, into the different working and teaching methods used, and their opinions about necessary support. The study suggests that most of the teachers studied need personally to discover the benefits of molecular modelling in their own work that illustrate on a practical level how molecular modelling can provide added value for teaching and understanding school chemistry. Teachers state that they need more pedagogical and technical training in molecular modelling so they can use it more and effectively in their own teaching. Furthermore, there is a need for easily adaptable learning and teaching materials to be made available to teachers in their domestic teaching language. (Contains 7 tables.)