This is a reminder of the upcoming scheduled system downtime for the Test Delivery System (TDS). TDS may be down from Friday, April 15 at 5:00 p.m. PT to Monday, April 18 at 7:00 p.m. to deploy the Science Summative and ELPA Summative tests for remote test administration. The full list of Scheduled Downtimes is available on the OSAS Portal.