What is a business impact analysis (BIA)? Definition from WhatIs.com
One of the basic assumptions behind BIA is that every component of the organization is reliant upon the continued functioning of every other component, but that some are more crucial than others and require a greater allocation of funds in the wake of a disaster. For example, a business may be able to continue more or less normally if the cafeteria has to close, but would come to a complete halt if the information system crashes.