David McLelland's motivational theory identified three principal motivational needs ; what are these three motivational needs?

Need for achievement

Need for affiliation

Need for power

Achievement (n-ach), the need to achieve things; Authority/Power (n-pow), the need to have impact, influence and authority; and Affiliation (n-affil), the need for relationships, interaction and acceptance among other people (or words to similar effect as these definitions)

Achievement , Authority and Affiliation

I fully agree with ALL EXPERTS . 

thanks.

McClelland stated that we all have these three types of motivation regardless of age, sex, race, or culture.

People who have a need for affiliation

 "Power is the Great Motivator", found that those in top management positions had a high need for power and a low need for affiliation. His research also found that people with a high need for achievement will do best when given projects where they can succeed through their own efforts. 

Need for achievmenet

Agree with Answer added by: Elke Woofter  .

Need for Power>>>>>>>>>>>>>Need for affiliation>>>>>>>>>>>>>>>>>Need for achievement

Agree with experts explanations.

Need for Power

- Seeking positions of leadership

- Good conversationalist

-Argumentative

-Outspoken

-Enjoy teaching and public speaking

* Need for affiliation

- Maintain social relationship

- Enjoy a sense of intimacy and understanding

- Console and help others in trouble

* Need for Achievement

- Desire for success and equally intense fear of failure

 Thanks  experts ,Q. has no more answers