Revisions as of January 11, 2010. GENERAL RULES No outside materials (notes, calculators, etc) are permitted in any event unless specifically stated in the event rules. Participants may not bring cell phones into any event room. RULE CLARIFICATIONS Before you start preparing your team, be sure to download the 2010 Rule Clarifications (Adobe PDF) complete with the number participants permitted in each event, required and optional materials, and event rule clarifications and revisions. EVENT-BY-EVENT CHECKLIST We've put all the information you need for each ESO at JHS event in one place. Download our 2010 Event Checklist (Adobe PDF), complete with time & location for each event, the number participants permitted, required and optional materials, and event rule clarifications and revisions. Your common questions are answered here!