necessity, ( as defined by abraham maslow).
i prioritize my "needs" separate from my "wants".
most of my human "needs" come first, and once fulfilled; then, i may have time to fill non-necessary "wants".
so then, the most important and immediate "needs" are categorized as "A"; these are needs to done immediately
those "needs" of importance but not immediate, i categorize as "B", and these can be fulfilled as soon as possible but not immediately.
"the "c" level of "needs" can be postponed and done as the time becomes available.
but in the end, the goal is to fulfill all of my needs. however, these may change according to circumstances. so, while it is important to have long-range goals, those short-term goals in the present , also need to be fulfilled.