I agree that the systems thinking description is very business related. I go back and forth with my fiancé, who is an engineer in manufacturing, and I am adamant that manufacturing efficiency doesn't have it's place in gardening or nature. Relationship and interconnectedness of systems all seem to go back to the coordination in nature, to me. When I have to think of input and output, I just do some contemplating of how things are growing naturally and try to incorporate that in my garden.