Guess the change

A 'change' is a bellringing term. Each 'change' is a different permutation of the bells. Examples are 12345678 , 13572468 or 87654321. The game is very simple. The computer thinks of a change. You suggest a change, and you will be told how many of the bells are in the same place as the one the computer is thinking of. On the basis of this information, you keep refining your guess until you come up with the correct change.