Maslow rather well classified most human needs in his pyramid of 5 levels.
This hierarchy of needs is predetermined in order of importance.
Hierarchy of human needs in Maslow's pyramid
It is often depicted as a pyramid consisting of five levels: the first lower level is being associated with Physiological needs, while the top levels are termed growth needs associated with psychological needs. Deficiency needs must be met first. Once these are met, seeking to satisfy growth needs drives personal growth. The higher needs in this hierarchy only come into focus when the lower needs in the pyramid are met. Once an individual has moved upwards to the next level, needs in the lower level will no longer be prioritized.
If a lower set of needs is no longer being met, the individual will temporarily re-prioritize those needs by focusing attention on the unfulfilled needs, but will not permanently regress to the lower level. For instance, a businessman at the esteem level who is diagnosed with cancer will spend a great deal of time concentrating on his health (physiological needs), but will continue to value his work performance (esteem needs) and will likely return to work during periods of remission.... (wikipedia)
Some additions can be made though:
A level 0 should be added below: fundamentals
A new lowest level should be added at the bottom of the pyramid, the basics of even having a pyramid at all: avoiding suffering and fear and the assurance that no suffering or fear is to be expected in the future either (this could be understood as a double scale, but for functionallity matters it's not necessary)
Some months ago I became aware there is even a deeper level under this
Faith (or hope/believes/convictions)
This is the ultimate reason of being. Faith in the future, the hope for something better/worthwile. Faith is the only one thing that makes people resist and survive even if fundamental needs are not met (hunger, pain, any other suffering...) Faith is hope, but a special kind of hope, it's hope with the conviction of achievement, one way or the other.
That is the reason why religions are so strong. They give hope, they give faith... which apparently are at the base of human needs.
But faith is definitely no synonym to religion. In fact, faith IS NOT religion. Religion is no more than a metaforic mechanism to project this (need of) faith on. But it is misleading and easily abused of. By the ones who preach these religions. Often used as a false argument against those who don't share the same religion. And the main cause of war and suffering throughout human history.
Faith is so much broader than religion. So much deeper. Faith is not about the comforting feeling of a superior being (generaly this wise and severe, but just old man with a beard) looking over us and ultimately deciding for us. Faith is about believing in ourselves and our fellow man, individually and collectively. Faith is about harmony in life, nature and the universe.
- Individual needs can be projected onto collectives
in other words the individual needs exist equally in a collective way or in groups, specifically: nations and societies (yeah, religions).
The scale-0 need on a collective level translates to no war or other types of massive violence.
This is of course definitely the ultimate lower level. No worry about scale 1 (eating, drinking or procreating) if you are being bombed or shot at
I'm not done with this yet..