Churchill and Lewis also developed a simple summary of the key factors which affect the success or failure of a business in the different stages of its life. These are split between the attributes of the owner -manager and resources. The important point is the move from the owner's operational ability to their strategic ability as the business grows. This is one of the key qualities of leadership. Lifestyle businesses can survive on high levels of operational ability and relatively lower levels of managerial and strategic ability. This changes at the take-off stage. Even when the business is mature, in the final stage, the ability of the owner to think strategically is still critical to its development. The other point to notice is the increasing importance of personnel and systems resources at the take-off stage. In lifestyle businesses these are less important, although some lifestyle businesses do have strong systems that allow them to 'tick over' with the minimum intervention of the owner-manager.