Margaret of Anjou England to prove himself before she followed. He did so, restoring Henry VI briefly to the throne on 3 October 1470. By the time Margaret, her son and daughter-in-law (Anne) were ready to follow Warwick back to England, the tables had again turned in favour of the Yorkists, and the Earl was defeated and killed by the returning King Edward IV in the Battle of Barnet on 14 April 1471. Margaret was forced to lead her own army at the Battle of Tewkesbury on 4 May 1471, at which the Lancastrian forces were defeated and her seventeen-year-old son Edward of
IEEE 1471 of software-intensive systems". It has long been recognized that "architecture" has a strong influence over the life cycle of a system. However, until relatively recently, hardware issues have tended to dominate architectural thinking, and software aspects, when considered at all, were often the first to be compromised under the pressures of development. IEEE 1471 was created to provide a basis for thinking about the architecture of software-intensive systems. IEEE 1471's contributions can be summarised as follows (in this list, items in "italics" are terms defined by and used in the standard): IEEE 1471 provides informative annexes that relate its concepts