This chapter describes in considerable detail the processes followed on a daily basis within Integrates Operations Centre (IOCs). It also describes the processes involved in regular operations and illustrates the sheer enormity of what can go wrong, and the cascading effects of these problems on airline assets and resources as well as the flying public. The IOC is a centre of expertise with substantial power to manage all aspects of the airline’s network of flights on a day-to-day basis. The approach of senior management must be to recognise the need for the IOC to have genuine authority to make autonomous decisions without the need for any intercession. The purpose of the chart for operational use is to provide a comprehensive means for displaying the airline’s fleet and schedules across a time period. Maintenance work of a shorter duration may be represented by a smaller placard, again coloured distinctively, and often evidenced by a small icon.