What is Possible to Learn in Risk Management from the Tragedy in Japan

In this podcast, Ricardo talks about the earthquake and tsunami occurred in Japan with regards to project risk management. He explains that any given risk has a probability greater than zero and less than 100%. Ricardo mentions that this earthquake was  above any risk evaluation that had been established so far, and cites the atomic power plant in Fukushima as an example, which had very high and strong walls but have been nonetheless destroyed by the tsunami.