(risk management in construction of marine projects (according to the pmbok

difference is on planning and the real execution of the projects in scope , time, cost and the quality derived from the effects of positive and negative risks involved in a project life time span which are unidentifiable sometimes. history of risk management shows that it's improvement has started with modern project management in the 1950 and this process has continued in next decades. several project management standards provide definition to project risk management. risk management is a process that includes the phases of risk: identification, estimation, response development, and processes for controlling risk in these activities. the risk management process of identification, estimation, and response development is generally repeated during the project process. recent development in the field have enabled better understanding of the overall risk management processes. this ranges from nine(cano,cruz1998),to eight(chapman, ward 1997),to six (kahkonen 1998) phases. the one of the these standards is pmbok(project management body of knowledge) that the american project management institute has published it ,and fortunately is using in our country expand. in this article, we show how to execute risk management according this standard ,and our experiences in huge marine projects.