For many years, cloud adoption was presented as a series of choices. These included such decisions as whether to adopt public or private cloud; or to ignore both and to stick with on-premise enterprise IT systems. Businesses also had to get to grips with a wide variety of services – starting with Software as a Service (SaaS) and then moving swiftly on to Infrastructure as a Service (IaaS) and Platform as a Service (PaaS). This raised further questions: which of these services would benefit them the most? Which should they invest in immediately and for which could they afford to wait?