In summary, observations 1 through 4 are advantages of incremental
testing, while observations 5 and 6 are disadvantages. Given current trends in the computing industry (hardware costs have been decreasing, and seem
destined to continue to do so, while hardware capability increases, and labor
costs and the consequences of software errors are increasing), and
given the fact that the earlier an error is found, the lower the cost of repairing
it, you can see that observations 1 through 4 are growing in importance,
whereas observation 5 is becoming less important.