This document discusses information carrying words (ICWs), which are the minimum number of words a child needs to understand to comprehend an utterance. It explains that as children develop, the number of ICWs they can understand increases with age. There are 5 levels of ICWs, from level 0 where context provides meaning to level 4 where children can understand sentences with colors and complex positions words. Each level is defined and examples are provided to illustrate the concept of ICWs and how they relate to a child's language comprehension development.