I recently created a new tag: decision-problems. I do believe that this tag is indeed needed because its lack does lead to a lot of somewhat erroneously or misleadingly tagged questions.
For example, a question that has been asked several times over the past decade is how to determine whether a system of linear equations and linear inequalities has a solution over the reals. This is a decision problem. This decision problem can be solved using, say, linear programming, which is a decision procedure. Usually, such questions have the tag linear-programming. However, Fourier-Motzkin could have been used as an alternative decision procedure.
Why are questions on decision problems being tagged with the tags corresponding to decision procedures? Because this makes little sense to me, I took the liberty of creating decision-problems.
Constructive criticism is most welcome. Thank you for the attention.