In the following year, 1956, while preparatory studies were being conducted for a general liturgical reform, Pope Pius XII surveyed the opinions of the bishops on the liturgical improvement of the Roman breviary. After duly weighing the answers of the bishops, he judged that it was time to address the need for a general and systematic revision of the rubrics of the breviary and missal. This question he referred to the special committee of experts appointed to study the general liturgical reform.