Strategy involves determining the company’s intent. Strategy is expressed in an understanding of the environment, an expression of ambition, decisions regarding the allocation of resources and plan of execution. Strategy provides a perspective on where and how the company will win from the inside out.
Design entails understanding and expressing customer intent. Expressed in terms of persona’s, needs, journey maps, touchpoints and prototypes. Design provides a perspective on how and why customers win from the outside in.
Source: Digital, Strategy and Design