It is generally accepted that in spite of having many characteristics in common no two schools are identical nor do they function in identical ways. It is not surprising, therefore, that innovations developed outside the school meet very different fates in different schools. The relative lack of impact on schools of such bodies as the Schools Council has led to a current emphasis on school-based innovation. Here again, however, schools manifest considerable differences. Some are noted for their ability to develop and implement innovations successfully, while others show little or no interest in innovation and yet others try to innovate but fail.