Needs

Maslow's theroy of needs is well known to those in the field of psychology.  Maslow's theory can be applied very well when talking about motivation in humans.  The needs begin in providing basic life essentials such as food, water, and shelter.  After the basic life essentials are met the person can meet more individual needs such as love and a feeling of belongingness.  This way of thinking about how humans go about meeting needs can be seen as a great way of motivation by people.
Maslow's theory offers a great way to see two types of motivation fuctioning within the same theory.  One part is biological motivation while the other is psychological motivation, while humans get motivation from both sources throughout their life Maslow's theory tends to believe that the biological motivations are stronger than the others because people can not survive without the bilogical nesecities and therfor no others sources of motivation matter until the first are met.