http://cdn.flamehaus.com/Valve_Handbook_LowRes.pdf

It is amazingly written as a guide to new employees.

The only useful part is 'What if we all screw up'.

The handbook tell the employee to listen to customers, but it seems no employee can actually do it in reality.

'When you have an idea -> tell your co-worker -> work together a product'

But their employee right now should be thinking: I have no idea.