This is extremely effective in a long-term game with many people.

It has proved extremely effective over the past few years.

He is extremely effective, so you always want him on your side.

For all his limitations, Law was an extremely effective politician.

A military leader is extremely effective in this area of treatment.

"President Obama has done something extremely effective, and when he does, this needs to be pointed out."

The first time it was extremely effective, the second time not at all.

Experts believe that when consistently used, they are extremely effective.

The systems are very rapid in their installation and extremely cost effective.

It was extremely effective when I was a small boy.