It was a simple idea, but the good ones usually are.

I just wanted to know your opinion about a very simple idea.

Back in those early days, people had simple ideas that worked.

Three or four big, simple ideas, even though the problems are complex.

A security policy goes far beyond the simple idea of "keep the bad guys out".

Who else would have ever thought of such an original, yet simple idea.

At the heart of this Bill is a simple idea.

The level of college education is too high for that simple idea.

And it shows the power of a good, simple idea.

They can't stand the simple idea of everyone just getting along and not trying to point fingers at each other all the time.