Keyboard Schematic

immediate help with keyboard please!?

hi there! ok so i have a school assignment on how keyboards work im done everthing except a pictorial diagram of keyboard labelled and a Schematic Diagram of a keyboard, please can anyone help me? and if not then what the most common type of keyboard? is it like iscci or something like that.
im not asking how a keyboard works im asking for picture diagrams labelled and/or Schematic Diagrams of a keyboard

The most common is the qwerty.
See link, this while not directly answering your question, may get extra credit

http://home.earthlink.net/~dcrehr/whyqwert.html

kawasaki DSI