Interior design is the art or process of designing the interior, often including the exterior, of a room or building. An interior designer is someone who coordinates and manages such projects. Interior design is a multifaceted profession that includes conceptual development, communicating with the stakeholders of a project and the management and execution of the design. Exterior design is the process of designing the exterior of the building. This includes the facade, roof, and foundational elements. While exterior design can be just as creative and artistic as interior, a knowledge of structural engineering is necessary. Exterior design is usually performed by an architect with help of civil and structural engineers.