2.9 When changing from priority rules to FIFO principle in a production area,... the average throughput times are reduced. production control becomes slightly more complex. the degree of freedom in production control (scheduling) is decreased. What happens if you change from using priority rules to use FIFO principle in a production area (keeping everything else constant)? average throughput time is reduced variance of throughput times is reduced variance of throughput time is reduced and average throughput time is reduced