1. Time-sharing
a. Prioritized credit-based -process with most credits is scheduled next
b. Credit subtracted when timer interrupt occurs
c. When credit = 0, another process chosen
d. When all processes have credit = 0, reaccrediting occurs
e. Based on factors including priority and history

2. Real-time
a. Soft real-time
b. Posix.1b compliant - two ****s:
FCFS and RR
Highest priority process always runs first