PMI Denmark Chapter

PMI Denmark Chapter

Fig 1 unknownsArticle by Henrik K. Søndergaard

Many project managers experience budget overruns and time plans that do not keep.

This can in many cases be minimized by included a budget for Unknown Unknowns. The method is simple and based on the three point estimation from The Successive Principle.

What are Unknown Unknowns

Fig 2 unknowns

The Successive Principle - how to estimate Unknown Unknowns

De How-2 in this video

Fig 3 unknowns

Where to find Unknown Unknowns

Fig 4 unknowns

Estimation of Unknown Unknonws

Fig 5 unknowns

Fig 6 unknowns

Budgeting of Unknown Unknowns

Fig 7 unknowns


Henrik SondergaardHenrik K Søndergaard, is a freelance senior project manager, who do ordinary project management, advisory board and training in the method and other PM tools and processes.

He has more than 25 years of experience in various project types and complexity. See more om LinkedIn ’Risk2EBIT’ or


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