Erratum Erratum An erratum or corrigendum (plurals: errata, corrigenda) (comes from ) is a correction of a published text. As a general rule, publishers issue an erratum for a production error (i.e., an error introduced during the publishing process) and a corrigendum for an author's error. An erratum is most commonly issued shortly after its original text is published. Patches to security issues in a computer program are also sometimes called errata. "Erratum", like "corrigendum", can also be used as a term for an error itself. According to the "Chicago Manual of Style", "Errata, lists of errors and their corrections, may
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,