The document discusses the Catholic Church's acceptance of the Standard Days Method (SDM) as a form of natural family planning. It provides context on the Church's rejection of collaboration with government population programs but acceptance of using SDM in its own natural family planning programs. It describes SDM as a calendar-based method developed by Georgetown University to identify fertile days in a woman's monthly cycle through using colored beads to track her menstrual periods. It was found to be an effective and widely acceptable method, especially for those who found other natural family planning methods difficult to use.