No Parallax Found! Check ID The Double Diamond Design Process The Double Diamond is a design process created by The British Design Council. Understanding the phases of the Double Diamond and how they interrelate is important. It helps decide the right methods and direction to take for pursuing a problem of opportunity. Smallfry utilise the Double Diamond process to define strategy, set a vision and plan to create an outcome. It is a useful tool to explain the design process to clients and help realise their opportunities.