Problems

A problem is an issue or obstacle which makes it difficult to achieve a desired goal, objective or purpose. It refers to a situation, condition, or issue that is yet unresolved. In a broad sense, a problem exists when an individual becomes aware of a significant difference between what is potential and actual.

Problem solving

Every theoretical problem asks for an answer or solution. Trying to find a solution to a problem is known as problem solving. That is, a problem is a gap between an actual and desired situation. The time it takes to solve a problem is a way of measuring complexity.[1] Many problems have no discovered solution and are therefore classified as an open problem.

Issues

The term issue is widely and wrongly used as a substitute for the word 'problem'. This use is believed to have originated in corporate communications where 'problem' is deemed to be too negative.