Risk management approach depends upon who you talk to - project managers have a different view from financial analysts who have a different approach from actuarties and so on. This can result in multiple and sometimes contradictory conclusions about the assessment of the risk of an event.
We frequently get questions about how complexity management is different from risk management. Luckily, complexity management does not suffer from this problem of diversity of opinions! But we believe that that Uncertainty, Risk and Complexity are all closely related and there is no contradiction.
More on this topic here.