Abstract
In students' problem-solving type of discussions, problematic solutions are often generated, which are included in the groups' final proposals. However, they lack concreteness, and/or do not meet the conditions of the problem situations. To prevent these problems, a self-checking stage is incorporated into the process of the discussion. In this study, the students' discourse of the self-checking stage is scrutinized along with their final products, to verify the effect of the self-checking stage.
