FPKNOSDMMN (MV304_18) indicates whether the man knows about the standard days method (SDM) or cycle beads as a method for family planning. Some samples differentiate between spontaneous and probed affirmative responses; see Comparability. In probing questions, the standard days method is often described by the following text:
A woman uses a string of colored beads to know the days she can get pregnant. On the days she can get pregnant, she uses a condom or does not have sexual intercourse.