How do they do it? See books: 
	* TheTwelveSimpleSecretsOfMicrosoftManagement by David Thielen. 
	* MicrosoftSecrets: How the World's Most Powerful Software Company Creates Technology, Shapes Markets, and Manages People. 
	* SteveMcConnell's books (at http://www.construx.com/stevemcc/books.htm), including SoftwareProjectSurvivalGuide, CodeComplete, RapidDevelopment and AfterTheGoldRush. 
	* DebuggingTheDevelopmentProcess
	* DynamicsOfSoftwareDevelopment
	* RenegadeOfTheEmpire
	* WritingSolidCode
	* ShowStopper
(With so many books, it must not be that much of a "secret" any more! ;-) 
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CategoryBooks