Abstract
The rhythm method of family planning requires the use of thermometers, calendars, charts, numerals, and words. Such a system cannot be used in countries like India, where the major part of the population is illiterate. Simpler technique, requiring neither reading nor writing, must be taught. An easy method, utilizing beads of bright colors, is described. An abacus is employed with six threads or lines, each strung with 30 beads corresponding to the 30 days of a calendar month. The entire abacus covers a period of six months. Beads of three colors are used: (1) one red bead for each day of menstruation, (2) one green bead for each day of safe period, and (3) one black bead for each day of fertile period. The first two lines of the abacus denote the preliminary training period. The patient is taught to thread one bead each day, red for menstruation and green
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