Abstract
In planning or design phase, project members make decisions with limited or uncertain
information. Those decisions might turn into risks. The facts which they make decisions with uncertain
information are not described on any specific documents, but only recognized by decision makers
themselves. Therefore, it is difficult for a third person to find out the risks. In order to manage these
types of risks, it is important for those who make decisions with uncertain information to share their
experiences. However, since not all engineers have the knowledge of risk management, it is extremely
difficult to describe risks appropriately. In addition, when various kinds of people are involved in the
risk identification process, same risks tend to be listed too many times because they are expressed
differently by different people. This article will discuss the standardization of risk description which
will reduce the fluctuation in expressing risks. Existing risk models will also be examined.
