Issue No.11 - November (1981 vol.14)
J.B. Munson , System Development Corporation
Software modifiability doesn't just happen. It must be designed, tested, and paid for just like any other software requirement.
J.B. Munson, "Special Feature: Software Maintainability: A Practical Concern for Life-Cycle Costs", Computer, vol.14, no. 11, pp. 103-109, November 1981, doi:10.1109/C-M.1981.220258