December 21 December 22, unless that date is a Sunday, in which case it's moved to the 23rd: December 22 "'Last Saturday before Christmas: December 22" Sunday before Christmas: December 23 December 26, unless that day is a Sunday, in which case the 27th: December 26 Last Friday before Christmas: December 28 Sunday after Christmas: December 30 December December is the twelfth and final month of the year in the Julian and Gregorian Calendars and is the seventh and last of seven months to have a length of 31 days. December got its name from the Latin word "decem" (meaning ten)
The purpose of a system is what it does The purpose of a system is what it does The purpose of a system is what it does (POSIWID) is a systems thinking heuristic coined by Stafford Beer. Stafford Beer coined the term POSIWID and used it many times in public addresses. In his address to the University of Valladolid, Spain, in October 2001, he said "According to the cybernetician, the purpose of a system is what it does. This is a basic dictum. It stands for bald fact, which makes a better starting point in seeking understanding than the familiar attributions of good intention, prejudices about expectations, moral judgment,