Qwerty keyboard was designed for the machine, to improve the performance of the machine not the typist.
Dvorak keyboard was designed for the typist, to make typing more efficient, more comfortable, faster.
Originally keys were laid out in alphabetical order which caused frequent jams of moving parts. Sholes rearranged the keys so that most frequently typed letters were spread apart to minimize the jamming. He obtained a patent for this keyboard layout which became known as QWERTY and became US standard 101 keyboard.
With the invention of electrical typewriter in 1930's which used a ball to type letters rather then moving arms, an opportunity arose to redesign keyboard layout to improve typing efficiency. From numerous keyboard layouts proposed and tested, Dvorak keyboard became the alternate American standard.
Dvorak keyboard was designated an alternate standard keyboard layout by the American National Standards Institute (ANSI) in 1982.In 1984 the Dvorak keyboard had an estimated 100,000 users. Today Dvorak keyboard layout software is available in Windows, Mac, Linux operating systems. It has also been called the Simplified Keyboard or American Simplified Keyboard, but is commonly known as the Dvorak keyboard. It was designed by Drs. August Dvorak and William Dealey in the 1920s and 1930s. The two studied letter frequency and the physiology of the hand and created the layout to adhere to these principles:
Dvorak keyboards are expensive - You don't need to rush out and buy Dvorak keyboard. Today's computers come with free Dvorak software installed and all you need to do is to switch in Control Panel to Dvorak keyboard.I already know Qwerty - if you do not have a need to retrain that's fine, but does the new generation have to use obsolete typing method because once up on a time there was a typewriter with moving arms in it?