At Valve, apparently they're crowdsourced from all employees: http://finance.yahoo.com/news/whos-boss-isnt-one-040100888.html http://finance.yahoo.com/news/who

At Valve, apparently they're crowdsourced from all employees: http://finance.yahoo.com/news/whos-boss-isnt-one-040100888.html http://finance.yahoo.com/news/whos-boss-isnt-one-040100888.h... You might want to look at 360 evaluations.