Since the early 2000s, the Standard Days Method (SDM) of family planning has been tested, introduced, and scaled up in countries around the world. SDM is a fertility awareness-based method for avoiding unprotected intercourse during the fertile period, days eight through 19 of a woman's menstrual cycle (for women whose cycles range from 26 to 32 days). Most SDM users utilize a visual aid-CycleBeads ®-to assist their correct use of SDM. In a 2002 trial, the method's first year failure rate (5 per 100 woman years with correct use and 12 per 100 woman years for typical use) was established, commensurate with certain other modern methods of contraception; since then, SDM has been introduced as well as studied in a variety of low and middle income countries (LMIC), and has been scaled up in some. This working paper summarizes the results of a structured review on SDM by the Evidence Project in 2014. This review utilized standardized search strings and systematic screening and abstracting criteria for reviewing available peer-reviewed and grey literature reports on SDM outcomes. Fifty-two reports and peer-reviewed articles were included and abstracted for data and information on client outcomes, provider outcomes, SDM service delivery characteristics, cost effectiveness, and implementation and scale up documentation. The included literature covered SDM implementation, scale up, social marketing, provider training, costing, and studies of most significant change in 23 countries from 1999 to 2014. This review of evidence on SDM tells us that the method appeals to a specific tranche of womenthose with unmet need, who desire to use non-hormonal contraception, and who are new to the use of effective modern FP methods. SDM as a method has correct and typical failure rates on par with some other modern methods of contraception (diaphragms, female condoms, and male condoms) and its prevalence is similar to some other modern methods that have been around for longer periods of time (female condoms, implants, IUDs, and male sterilization). SDM is easy to use and satisfying to users, it increases knowledge about the fertile period among both women and men, and it promotes male engagement in FP. It can be offered by a range of public and private providers throughout the health system. Scale up of SDM use requires stakeholder buy in and participation, early introduction of SDM into policies, guidelines, norms and curricula, inclusion of SDM into HMIS, procurement, and training systems, supportive supervision and refresher training, and publicprivate partnerships. In order to facilitate sustainable and systematic scale-up, particular attention needs to be to the procurement and availability of CycleBeads ® , agreement within the international community that SDM is a modern method, inclusion of SDM in national surveys, and the expansion of cadres providing SDM. IRH SDM Implementation and Scale up Studies Special studies undertaken within IRH Implementation and Scale up Studies 2 Other 3 Efficacy Trial Method Working Paper ▪ 45