The economic success of manufacturing firms depends on their ability to identify the needs of customers and to quickly create products that meet these needs and can be produced at low cost. Achieving these goals is not solely a marketing problem, nor is it solely a design problem or a manufacturing problem. The design function plays the lead role in defining the physical form of the product to best meet customer needs.

When the contraction of muscle is occurred, electrical signals are also generated in the muscle. Information about the electrical activity in the muscle can be represented as the height of the wave and the density of the waves. Such a technique is called an electromyography(EMG).

Electrical activity of the brain is produced by billions of brain cells, called neurons. Electroencephalogram (EEG) is the summation of the excitatory and inhibitory activities that occur in underlying brain neuron.