" The actual implementation of the controller object can vary quite a bit, but the idea of an object to 'transform' events to changes in data and execution of methods is the essence of this pattern. What does "event driven" mean? Was there ever an application which did not respond to user events . . ? Just because an application responds to events does not mean it is "event driven". Event driven means it spends much of its time waiting for an event and then takes action if and when an event occurs. Contrast this with some programs that do not respond to events at all, but simply do their job and terminate. For example, an operating system command to display the current time. Teen Fashion Model Portfolio It displays the time and is done; it does not wait for events. For more information, see: Event-driven_programming Implementations The pattern was first described in 1979 by Trygve Reenskaug, then working on Smalltalk at Xerox research labs. "

"6 MeV Muon antineutrino 0 1 0 0 1 < 0. 5 MeV Charm quark c +2/3 2 +1/2 +1/6 3 ~1. 5 GeV Strange quark s -1/3 2 -1/2 +1/6 3 ~100 MeV Anti-charm antiquark cc -2/3 1 0 -2/3 ~1. 5 GeV Anti-strange antiquark sc +1/3 1 0 +1/3 ~100 MeV Generation 3 Tau τ -1 2 -1/2 -1/2 1 1. 784 GeV Tau neutrino ντ 0 2 +1/2 -1/2 1 < 70 MeV Anti-Tau τc 1 1 0 1 1 1. 784 GeV Tau antineutrino 0 1 0 0 1 < 70 MeV Top quark t +2/3 2 +1/2 +1/6 3 173 GeV Bottom quark b -1/3 2 -1/2 +1/6 3 ~4. 7 GeV Anti-top antiquark tc -2/3 1 0 -2/3 173 GeV Anti-bottom antiquark bc +1/3 1 0 +1/3 ~4. African American Fashion Model7 GeV * - These are not ordinary Abelian charges which can be added together but labels of Group representations of Lie groups. ** - Mass is really a coupling between a left handed fermion and a right handed fermion. "