In art, design, science, technology, medicine and public policy many activities are undertaken by interdisciplinary teams. In science and technology, these take the form of scientists and engineers from many different disciplines working together on a single project. It is this situation, in which different groups of specialists with different, mutually incompatible and sometimes incomprehensible ideas nonetheless manage to find a way of communicating with each other and working together that inspired Peter Galison to develop the original trading zones metaphor. Similar teams are often found in public health settings, where cases are decided by multi-disciplinary teams comprising social workers, psychologists, psychiatrists, lawyers and so on. In the trading zone case, these teams work by developing a new composite language, called a pidgin or creole language, which the group shares and uses to communicate. The idea of trading zones has been developed by Mike Gorman, who has identified different types of trading zones, and examined their operation in a range of settings, including nanotechnology. Interactional expertise offers an alternative to this approach. Instead of a new language emerging, some members of the group learn the language of the others and shift back and forth between the two worlds. This is more akin to translation between two cultures rather than the creation of a new, shared, culture.