Wicked Problem (glossary)
Wicked problems are ill-defined, ambiguous and associated with strong moral, political and professional issues. Since they are strongly stakeholder dependent, there is often little consensus about what the problem is, let alone how to resolve it. (Ritchey 2011)
Ritchey, T. 2001. Wicked Problems: Structuring Social Messes with Morphological Analysis. Stockholm, Sweden: Swedish Morphological Society. Available online at: http://www.swemorph.com/pdf/wp.pdf. Accessed July 7, 2012.