Issue No.04 - April (1978 vol.11)
R.A. DeMillo , Georgia Institute of Technology
In many cases tests of a program that uncover simple errors are also effective in uncovering much more complex errors. This so-called coupling effect can be used to save work during the testing process.
R.A. DeMillo, R.J. Lipton, F.G. Sayward, "Hints on Test Data Selection: Help for the Practicing Programmer", Computer, vol.11, no. 4, pp. 34-41, April 1978, doi:10.1109/C-M.1978.218136