Open Compute Project is an initiative announced on April 2011 by Facebook to openly share custom data center designs to improve efficiency across the industry.<ref>http://www.facebook.com/notes/facebook-engineering/building-efficient-data-centers-with-the-open-compute-project/10150144039563920<ref>The level of openness was historically unprecedented since companies that custom design their data centers tend to want to keep their designs a closely held corporate secret.[citation needed]