Most organisations opting to use the cloud as part of their IT infrastructure still retain in-house systems too, often as a private cloud. In this hybrid environment, getting your IT architecture right is critical – it ensures security and interoperability; it allows you to scale up, down and between private and public clouds; it makes sure system performance is maximised. A good architecture avoids lock-in to any one supplier or cloud provider, and makes sure you have the flexibility and agility to respond to business change. But it’s not easy. In this CW500 video, Don Kavanagh, former chief architect at Home Office SIA , talks about architecting technology for the cloud.