We present an approach to computer-based training that takes advantage of two techniques related to modeling. Dialogue modeling (DM) and model-based training (MBT) are examined here with a view to using DM to provide the models needed in MBT. Our work is motivated by the fact that certain domains are very difficult to produce models for, which makes MBT impracticable.We describe a computer-based training agent that has been developed as a result of using dialogue analysis and DM techniques. MBT is investigated as a technique that could be compatible with DM to support instruction through use of dynamic model-based explanations. Together these two techniques enable a computer-based training system to be designed that is able to support technical skills, such as controlling a power plant, and creative skills, such as design.