Explain why studying human needs is believed to be an important part of motivation theory.

Every human being is considered to have a different prospect s and goals in life. For some money might be a motivation factor and for some it might be a designation, position or authority.  In order to keep one motivated the first and foremost thing is to identify his/her need.

Psychology has such a thing as hierarchy of needs.

You can always see how things appeal to others and what are their basic neccesseties. Most HR's use questioners to detect what works for the person and his type of personality based on the above. It's vital not only for the well being of the organization but for the development and better growth of the person and the organization.

With out understanding the needs how one can fulfil, different peoples having different problems and needs so as a expert you have to find out and solve if you want to motivation.