Starting with approximately 800 COBOL test programs I increased the regression test suite to over 4,000 programs in one year. The regression test suite originally ran in 72 hours. At the completion of this project the test suite required 30 days to run from end to end. Since 30 days was too long to satisfy the project turnaround requirements, I parallel zed the test suite so that it ran on six computers in approximately 5 days.