Dual numerical keyboard based on dominance

A method for the non-trial and error definitive selection of a numerical input device for the left hand of a user based on the human factors of dominance research comprising:

• administering a plurality of cerebral dominance tests;
• wherein said plurality of cerebral dominance tests involve a torque and/or circling motion between both hands of the user for determining hand and finger directionality;
• wherein said plurality of cerebral dominance tests comprise:
• a parallel clockwise—clockwise dominance test, a mirror image counter-clockwise clockwise dominance test, a mirror image clockwise-counter clockwise dominance test, and a handedness and finger directionality test;
• the parallel clockwise—clockwise dominance test results with a subsequent recommendation for left to right number direction for the left hand for the device,
• the mirror image clockwise-counter clockwise dominance test results with a subsequent recommendations for right to left number direction for the left hand for the device;
• comparing the plurality of cerebral dominance test results against one another to determine hand and finger directionality;
• selecting said numerical input device based on the determination of hand and finger directionality;
• wherein the selection of the said numerical input device is from a group consisting of:
• a keyboard, a numerical data input device, a calculator, a ten key calculator, an alternative keyboard, an alternative keypad, or a dual keyboard and keypad;
• and
• configuring said numerical input device based on the determination of the plurality of cerebral dominance test results.