Red > Green > Refactor > Red

cycle is based on desire

dwh/bi

http://www.bbreak.co.jp/maeyes/column/column7.html

dwh

http://stackoverflow.com/questions/3419353/what-is-the-difference-between-a-database-and-a-data-warehouse

bi

http://dba.stackexchange.com/questions/6619/can-you-give-me-one-example-of-business-intelligence