Competence in collaboration is one of the critical abilities that interior design majors are expected to develop during the course of their education; however, few students are competent to collaborate with others online. The purposes of this study were to identify student perceptions and performance in online collaboration compared to those of offline collaboration and to explore the way students collaborate online. A total of 29 junior interior design students participated in the study. After finishing each online and offline collaborative project, they completed a survey. The findings show that students are more satisfied with offline collaboration and perceive offline collaboration as more effective than online collaboration; however, no significant difference was apparent in student performance online and offline. In addition, the findings show the need to provide appropriate online interface for design collaborations. This paper includes lessons learned and recommendations to promote both online and offline collaboration in a design studio.