This study has been started as a part of a research, related to exploring impact of novel interfaces during collaborative architectural design process on designers' way of thinking. However, in this paper it is intended to focus on how the input devices reflect on designers' modeling behavior in computer environment. Therefore it is intended to compare designer's modeling approaches in computer environment via a case study. Four master students in architectural design computing graduate program have attended to the case study. The findings of the case study is presented and evaluated in the discussion section.