The sketch design stage establishes a site strategy and architectural concept by exploring different possibilities for space layouts and presenting the best option within the constraints of a design brief, site configuration, authorities planning requirements and budget. This process addresses such issues as orientation, aesthetics, circulation and energy efficiency. Often as the design progresses the brief and budget may be adjusted as the design evolves. This process can save clients thousands of dollars by evolving loose design concepts into the most efficient use of space and natural resources.