Project management techniques differ from company to company because it is due to availability of resources and past experiences. Larger companies will more resources to work with, and I’m sure they have gone through many projects and have learned from them all and have optimized their techniques fully. Smaller companies need to pick and choose what projects they pursue and might have as much money and resources to play with. A project failing could be a disaster for them, with closing down being a end result. So they don’t have the same level of experience as larger companies do, and aren’t able to take on as many risks as larger companies can and learn from them.