984c318e_Summary__Forum_and_Expert_Tips__Theory_Y
[Theory X] Because people dislike work they have to be coerced or controlled by management and threatened so they work hard enough. [Theory Y] 
Provided people are motivated, they will be self-directing to the aims of the organization. Control and punishment are not the only mechanisms to let people perform.
McGregor's Theory X and Theory Y: Summary, Forum and Expert Tips
Theory Y