In this article I want to share the experiences of developing an interdisciplinary course which brings together design oriented work practice studies and software development. The development and the teaching of this course took place as part of the study program 'People, Computers, and Work' bringing together human work science and computer science. To relate work practice studies and software development in a fruitful way, we had to change not only the organization of the projects and the layout of the course. It required also relating paradigms and methods on both sides. The teachers had to learn about each other's disciplines, too. An example of one of the projects - a web-shop for stationary - illustrates the way the students worked. Us teachers learned also a lot: Both ethnographic methods to study the workplace and software development methods change if really brought together. The variety of ways of relating work practice studies to software development surprised us. We explored common themes relevant for the interdisciplinary practice. And we learned a lot about how to teach this kind of projects.