(object-oriented programming) The ambiguity that arises when two classes B and C inherit from A, and a further class D inherits from both B and C, so that if there is a method in A that B and/or C has overridden, and D does not override it, it is unclear which version of the method D should inherit.

(mathematics) A mathematical problem, asking whether a room with mirrored walls can always be illuminated by a single-point light source, allowing for repeated reflection of light off the mirrored walls. It was solved in 1958: there are such rooms that cannot be thus illuminated.

plural of wicked problem

(social planning) A problem that is difficult or impossible to solve because of incomplete, contradictory, and changing requirements that are often difficult to recognize.

(idiomatic) A problem expected with any new and untried product, system, or venture

Alternative spelling of subproblem

plural of sub-problem

A concise description of a problem

plural of champagne problem

(statistics) The difficulty in drawing inferences from cross-cultural data, due to the statistical phenomenon of autocorrelation.