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Another sterling example has just come to my attention - Valve Software, probably the single most creative large video game studio in the world, is run on nonhierarchical syndicalist lines. Projects are not assigned, but are created and spearheaded from the bottom up by self-constituted teams subject to flux. There are even serious elements of communalism, as pay rates are at least in part based on a system of mutual value ratings. You can read more about these practices at The Wall Street Journal and Develop Online.
The example does highlight a consistently emerging caveat - obviously, a software development company is generally staffed by people who are already highly trained, motivated, and disciplined. And even within the company's own literature, there's an acknowledgment that when someone who doesn't fit that mold lands a job at the company, it can be disruptive and take some time to shake out. Does this indicate that anarchism, for all its bottom-up rhetoric, works best at its highest level of institutional development when it's being used to organize the elite? Regardless, it's yet another exciting sign that we're looking at the political philosophy of the 21st century. Not only is it right - it works.