Learning in TELE requires self-regulated learning (SRL) that requires decisions about what, how, when, and where to learn. An approach for fostering SRL is the use of scaffolds. Our approach is collaborative scaffolding within a competition framework. Generally scaffolding is effective and has a medium effect size (Van de Pol, Volman, & Beishuizen, 2010; Swanson & Lussier, 2001). In a meta-analysis, Johnson, Maruyama, Johnson, Nelson, & Skon (1981) show cooperation as more effective than interpersonal competition and individualistic efforts. Furthermore an additional justification of answers can enhance learning performance (Falze, Dahar, & Niwaz, 2010). Within an existing LMS we developed COSAMUI (Collaborative scaffolding with multiple-choice). The module includes the following remote but cooperative learning activities: Creating groups of two students, planning time-management, proposing and commenting answers, reviewing answers, solving questions and monitoring results. The α-Version has been exposed to a test for usability with six students, demonstrating that COSAMUI works. Currently the module is set up in a separate learning unit. We are investigating COSAMUI within a counterbalanced measures design, analysing quantitative data on performance, learning motivation and online activity, and rating qualitative data on quality of comments and peer reviews. Results of the study will be presented.