How do we differentiate between Effectiveness and Efficiency?

KRISHNA HAS GIVEN NICE PRESENTATION............. AGREED WITH HIM,

Effectiveness is a relative measurement (whether or not/to what extend)  the degree to which tasks are completed with the given goals in a most appropriate way.  

Efficiency is an economic measurement about doing things in its optimum.  

Effectiveness is making the right decisions and successfully implementing them whereas efficiency is using resources wisely and in a cost-effective way.

hello

if management have a the70 percent at his power and ability in work he is efficiency and if that percent become to40 or50 he is effectiveness in business.

Agreed with Mr. Vrindavan