Hi everyone! I just would like to let you know that CMS has been used on the Chilean Olympiads in Informatics (OCI in spanish). We ran the system on Amazon EC2 machines. We had two rounds. The first one was a classification round, distributed on around 7 venues. We used one medium instance for the core of CMS including Contest Web Server, Administration interface and Ranking Web server, plus 8 small instances running a Worker each one. With a load of 75 users and no issues. For the national round we had 18 contestants. We ran with the following setup: 1 small server for the CMS core, including Contest Web Server and Admin interface, 2 small instances running a worker each one, and 1 small instance running the Ranking Web Server. Again, we had no issues. I would like to thank all the people working on CMS. It allowed us to organize a national competition without having to worry too much about the judging system. We even made some mistakes with the input/output of one problem, and the system allowed us to fix the problem and reevaluate the submissions quite easily. CMS just worked flawlessly. It would be great if you would like to add us to your testimonials list. Regards, Luis Alberto Herrera Tech Lead OCI 2013