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The culture at Valve is pretty much crowdsourced. The handbook is a wiki. One of the first things we say to new hires is, 'You have to change something in the handbook.'

"Valve’s Gabe Newell discusses the frontiers of gaming, from wearable technology to 'tongue controllers'". Interview with Ed Fries, venturebeat.com. July 25, 2012.
The culture at Valve is pretty much crowdsourced. The handbook is a wiki. One of the first things we say to new hires is, 'You have to change something in the handbook.'