In September of 1962, a news item was released stating that an $18 million rocket had been destroyed in early flight because "a single hyphen was left out of an instruction tape."... The nature of programming being what it is, there is no relationship between the "size" of the error and the problem it causes. Thus, it is difficult to formulate any objective for program testing, short of "the elimination of all errors" - an impossible job.

The Psychology of Computer Programming: Silver Anniversary Edition by Gerald M. Weinberg

ISBN: 0932633420 Page: 247, Chapter 13 This book is available from Amazon