When planning a computer system, the goal should be to enable staff to access as much data and functionality as possible without the need to refer to paper copies of documents. Instant access to email, online resources and even radiographs and laboratory reports will streamline activities on a day to day basis, and should ideally be available from every terminal on the network. This chapter covers the components of the practice computer system, practice management systems, IT policies, the use of IT for marketing, electronic payments and telecommunication in the practice.