ICS Implementation 1: How many ICS units should be in place? This ICS Unit guide is for the purpose of outlining the required units and sizes for handling an incident. Some of the units in the chart below are not found in the this ICS eTool but are mentioned here to illustrate that the ICS can be used as a guide to fulfill all the needs of an incident and can be dynamic in structure. The following sections list unit positions and gives suggested numbers based on number of divisions including: (1) Command; (2) Operations; (3) Planning (4) Logistics (5) Finance/Admin. See more from topic source: https://www.osha.gov/html/a-z-index.html