<qa>  What is the primary aim of the study?The primary aim of the study is to describe and compare the performance of a set of three prototype Click-MUAC devices against a gold standard of classification, in terms of measures of agreement sensitivity, specificity, accuracy, Cohens Kappa, Youdens J for the classification diagnosis of acute malnutrition. A secondary aim of the study is to determine the difference in agreement with the gold standard classification amongst motherscaregivers using a Click-MUAC prototype versus motherscaregivers using a regular MUAC tape. The hypothesis of the study is that at least one of the Click-MUAC prototypes is equal to the gold standard of classification in terms of measures of agreement for the classification of acute malnutrition. A secondary hypothesis of the study is that agreement with the gold standard classification is better amongst motherscaregivers using a Click-MUAC prototype compared to motherscaregivers using a regular MUAC tape. The outcomes of the study will be used to decide on whether production of a Click-MUAC device is desirable and, if this is the case, to select a design based on the performance of the prototype devices and the stated preferences of intended users. 