The differences among methods lie in which fertility cues they employ, how detailed the observations of those cues are, and which rules are used to determine the start and end of fertility each month (the couple’s “Fertile Window”). Methods can also vary based on the expected relationship between client and teacher, so when you are looking for a method, be sure to choose one that suits YOUR lifestyle and needs.
How you use NFP may change over time and will vary from couple to couple. For a couple looking to postpone pregnancy, they follow rules to avoid intercourse during their fertile window. For a couple looking to achieve pregnancy, rules are applied to target their fertile window. The degrees to which you accurately observe, chart, interpret signs, and follow rules for your method will help determine the efficacy of that method.