Case-based learning formats, in which relevant case information is provided just in time, require teachers to combine their scaffolding role with an information-providing one. The objective of this study is to establish how this combination of roles affects teacher behavior and that, in turn, mediates students' reasoning and problem solving. Data on actual behaviors, intentions, effects and appreciation were collected using observations of case discussions, interviews, and a questionnaire in a mixed method, concurrent nested design. Cross-case analysis of the observed discussions revealed two patterns of combining the provision of information with scaffolding. Although students commonly responded to scaffolding interventions as intended, the results from the observations and the questionnaire showed that a pattern with a high level of concurrent scaffolding and provision of information should be avoided. (Contains 4 tables and 1 figure.)