Cordwainer "cobbler" have often been considered not interchangeable, according to a tradition in Britain that restricted cobblers to repairing shoes. In this usage, a "cordwainer" is someone who makes new shoes using new leather, where as a "cobbler" is someone who repairs shoes. Medieval cordovan leather was used for the highest quality shoes, but cordwainers also used domestically produced leathers and were not solely producers of luxury footwear. In the historic London guild system, the cobblers and cordwainers were separate guilds, and the cobblers were forbidden from working in new leather. Historically, cobblers also made shoes, but only using old leather
The purpose of a system is what it does be balanced by a more straightforwardly descriptive view. The term is used in many fields including biology and management. 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