Vocational education and training (VET) in Australia, as in many countries, has undergone considerable reform over the past 15 years. One of the key features is that VET teachers have been increasingly encouraged to shift their practice from the classroom to the workplace. This chapter examines ways in which a group of VET teachers learned how to work in companies and navigate the spaces between Communities of Practice in the company and those in their 'home' institute. It is based on 34 interviews in six case studies, each case comprising a VET institute and a company. The findings highlight how Communities of Practice might be used as an explanatory framework to assist teachers to make meaning of their work with industry, and of the challenges they confront as they move between different sites of practice.