"All 4 quadrants show growth, development, or evolution. That is, they all show some sort of stages or levels of development, not as rigid rungs in a ladder but as fluid and flowing waves of unfolding."
So in a nutshell, Ken defines the IOS as "That Integral Model-"all quadrants, all levels, all lines, all states, all types"-is the simplest model that can handle all of the truly essential items. We sometimes shorten all of that to simply "all quadrants, all levels"-or AQAL-where the quadrants are,for example, self, culture, and nature, and the levels are body, mind, and spirit, so we say that the Integral Approach involves the cultivation of body, mind, and spirit in self, culture, and nature". Sounds simple enough doesn't it??
Its relation into health comes from when we apply the quadrants and other elements into the sphere of health.
At a very basic level, our medical system can be seen to be mainly focussed on the Upper Right quadrant (UR), the physical body and its components and behaviours. We can also see this quadrant holds the key for our nutrition, what components do we put into repair this body. But also part of the effect of yoga or Qi Gong is viewed from this perspective in its effect on the physical, subtle and causal bodies. As could be the external effects of physiotherapy, massage, Bowen Technique, Chiropractic etc.