Reference #133: Peopleware
Parkinson's Law — that work tends to fill the time allotted for it — is not an axiom. The law is not based in data (having been written by a humorist). And it is certainly not true for software teams.
When the law is occasionally true, it is often within the context of heavy bureaucracy and relating to organisational busy work.
DeMarco, Lister. Peopleware, 2013. (26-27, 29)