Centric Systematic Area Sampling or CSAS was developed in 2002 and was initially used to test and reform the community-based therapeutic care or CTC model of service delivery, later referred to as community-based management of acute malnutrition (CMAM) or integrated management of acute malnutrition (IMAM).
Since then it has been used as an evaluation tool but has proved too resource-intensive to be used for routine monitoring. Although largely superseded in this area by the less resource intense SQUEAC and SLEAC, CSAS is still an effective method for estimating and mapping coverage with useful precision and can be used by teams experienced with the technique and for final evaluations.
CSAS uses a two-stage sampling design. The first stage is a systematic spatial sample of the entire service area to select the communities to survey. The sample is therefore representative of the whole area. The second stage is an active and adaptive case-finding method that finds all or nearly all SAM cases in the communities being surveyed. Hence, the sample is representative of the communities surveyed.
CSAS yields the following results:
- Overall coverage estimate
- Local coverage estimates which can be represented as a coverage map
- Ranked list of barriers
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