This contribution presents a short review of dynamic risk evaluation techniques based on human and organizational factors, from the first approaches developing indicators to the aggregation methodologies integrating risk analysis. A methodology for the evaluation and update of expected release frequencies is taken as example of last generation techniques. The methodology aiming to support dynamic risk assessment studies is named TEC2O - Frequency modification methodology based on TEChnical Operational and Organizational factors. The potential of such methodology is described also in terms of support to risk based decision making for Oil&Gas integrated operations
