Serena Canada is a registered charity that specializes in the teaching of the Symptothermal Method of natural family planning (NFP) through promotion, awareness, education and advocacy for this method. The method is supported by national medical advisors. When followed, the method has similar effectiveness to birth control pills (When using the Symptothermal Method to avoid pregnancy 99% of women do not experience an unexpected pregnancy). The science and reliability of the Symptothermal Method comes from the consistency of using three data points to chart the female monthly cycle.