As I see it, the only way to find out who is the real target is by a process of trial and error.

Man could have been a lengthy process of trial and error.

The mission has become a breathtaking, heartbreaking process of trial and error.

He arrived at abstraction after a prolonged process of trial and error in the late 1940's.

For me, it was really a process of trial and error.

Working out each new spoof is "a process of trial and error," he said.

"That will have to come," said Sheridan, "by a process of trial and error."

Often this is a process of trial and error.

It would have to be a process of trial and error, you understand.

I think it will be a process of trial and error, just as the show has been all along.