By Glenford Myers, John Wiley & Sons, 1979 This small book is one of the classics on software testing. Myers covers boundary-values, equivalence classes, and how to test in general. The technical aspects of testing are still relevant. The process methodology is outdated.
[p36] What subset of all possible test cases has the highest probability of detecting the most errors?
[p50] It is difficult to present a “cookbook” for boundary-value analysis, since it requires a degree of creativiy and a certain amount of specialization toward the problem at hand.
[p56] It has a beneficial side effect in pointing out incompleteness and ambiguities in the specification.