This work is the first step towards developing an ontology of intensive care unit orders. A data set comprised of 625 ICU orders from 34 randomly selected patients of several ICU's at the Oregon Health and Science University, previously compiled by Laura Fournier, was analyzed to develop the order categories components hierarchies and relationships among the components in the hierarchy. The purpose of this project is to develop a tool for the health informaticians who would like to search for information associated with a particular term or element in an order set as to verify its relationships in the hierarchy of the ICU orders and with other elements of a particular order.