"The expected benefits of modular programming fall into three classes: (1) managerial -- development time could be shortened because separate groups would work on each module with little need for communication (and little regret afterward that there had not been more communication);"

-- D. L. Parnas, ON THE CRITERIA TO BE USED IN DECOMPOSING SYSTEMS INTO MODULES, 1971, https://prl.ccs.neu.edu/img/p-tr-1971.pdf