Explain The McClelland’s theory of Need Achievement

McClelland’s  theory of Need Achievement:

McClelland a psychologist and his colleagues began to experiment with thematic apperception Test (Tat)  to determine if it was sensitive enough to detect changes in motivation that were caused by psychologist believed in the presence of three types of basic motivating needs shortly after second world war.

• Need for Power: This relates to have control over other people & object in the environment similar to that of the Ego needs.
• Need for Affiliation: This relates to desire to belong to, to be part of the group & to have friends. Similar to that of social needs.
• Need for Achievement: This relates to the need to achieve something. Similar to ego & self-actualization needs.