When companies are seeking to establish appropriate corporate governance policies, they often look to model themselves after those titans of industry in the Standard & Poor’s 100.

But according to a new study out Thursday from Fenwick & West, authored by partner David Bell, there’s a lot of variety when it comes to “best practices”­—especially when you look at successful Valley companies. That’s a primary reason Bell began putting together the survey, “Corporate Governance Practices and Trends: A Comparison of Large Public Companies and Silicon Valley Companies,” which examines trends from 2004 through the 2013 proxy season.