Over 2,000 years ago, Vitruvius defined the essential elements of good design.
Commodity: designs should support the needs of users and the wider community.
Firmness: designs should be robust, flexible, adaptable and re-useable.
Delight: designs should maximise opportunities to inspire and create joy.
These principles are still applicable today.
via page 16, Smart Communities Guide – http://www.science.qld.gov.au/dsdweb/v4/apps/web/content.cfm?id=11004