plan; policy / the fifth of the Eight Principles of Yong

plan, policy

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness

necessary evil

unsolved, unresolved