 The Click-Mid-Upper Arm Circumference study aims to describe and compare the performance of a set of three simplified mid-upper arm circumference classification devices Click-MUAC for use by mothers and caregivers to screen for acute malnutrition in young children. The study will be conducted in Isiolo County, Kenya. The study builds on the recent approach of training mothers to screen for acute malnutrition in their own children mother MUAC approach. 