This document provides guidance on assessing and classifying diarrhea based on signs of dehydration. It describes how to determine if a child has no dehydration, some dehydration, or severe dehydration based on symptoms like lethargy, sunken eyes, and skin pinch test. It then provides treatment instructions for each classification, including giving oral rehydration solution or fluids and referring urgently to the hospital if severe dehydration or other severe signs are present.