Recently, many companies in the Information Technology (IT) industry are shifting focus from software development to providing software services. So, the design thinking that proposes to start from the user's point of view is accepted by many industries. We executed the collaboration workshop that the IT students learn practical lean start-up by short-term PBL (Project Based Learning) with overseas engineers. There are two aims of the workshop. The one is an exercise of business idea creation and verification it using lean canvas. The other is the learning of team building and communication. The communication includes the team building. It is a just 5 days' workshop, but the students got the progress in communication skills and also engineers improved their communication skills, business creation skills and changed their business viewpoint. In this paper, we report on its detail and efforts.