Professor Kalle Kähkönen Tampere University of Technology, Finland: My earlier discussion under the title “Riskiness as a viewpoint for categorizing projects” pointed out the significance of defining and understanding the overall risk level of project, and how this forms a starting point for categorizing projects, which is necessary when comparing and contrasting different project options.  Naturally, this is one of the key tasks of project portfolio management. Credibility of the overall risk estimates is essential, ...