Never heard of it. Going to follow though. Thanks.
Discussion
It's essentially leveraging & managing the natural succession of soil to forest. It uses support species to produce bio mass in situ, provide shade/shelter for short, medium & long term crops.
Systems are reset lightly or heavily depending on the primary crops you're focusing on & what you're wanting. This provides bio mass above ground but also collectively stimulates all plants in the system via the roots.
Caveat - I'm still a newbie & don't know what I don't know