The use of PPS sampling and the small number of SAM cases found by SMART surveys means that estimates of coverage made by SMART surveys may be inaccurate (i.e. biased by taking the sample from the most populous communities) and will usually be imprecise (i.e. due to the small sample size of SAM cases). SMART survey data may, however, be used with other data to inform priors in SQUEAC stage 3 surveys. For more information refer to: Myatt M, Feleke T, Sadler K, Collins S. A field trial of a survey method for estimating the coverage of selective feeding programs. Bulletin of the World Health Organisation 2005; 83:20-6. http://www.who.int/bulletin/volumes/83/1/20.pdf Source: Guevarra E, Norris A, Guerrero S and Myatt M, Assessment of Coverage of Community-based Management of Acute Malnutrition, CMAM Forum Technical Brief July 2012, Version 2: September 2014. Accessible online here.