Pittsburgh Public Schools officials have enacted a policy that sets 50 percent as the minimum score a student can receive for assignments, tests and other work. District spokeswoman Ebony Pugh said, the 50 percent minimum gives children a chance to catch up and a reason to keep trying. If a student gets a 20 percent in a class for the first marking period, he or she would need a 100 percent during the second marking period just to squeak through the semester. The district and teachers union issued a joint memo to ensure staff members' compliance with the policy, which was already on the books but enforced only at some schools. At this rate, it won't be long before schools institute double extra credit Mondays and Fridays to ensure students don't take three day weekends.