Sensiplan is a fertility awareness-based method of family planning, known also as natural family planning ("NFP"). Originally developed in Germany over a period of decades by the Arbeitsgruppe NFP ("NFP Working Group") at the international aid agency Malteser International, and with help from the German Ministry of Health. Natural & Safe: The Handbook describes the method and its applications in detail and is an important Sensiplan resource. It is designed to work in conjunction with Natural & Safe: The Workbook, a practice manual that provides practice charts, case examples, and specific instruction for using the method throughout various phases of life. Both volumes are translated now for the first time in English.