The most important idea in Systems Thinking (ST) and the reason why ST was formally born as a pushback in the ways that science was being practiced. The Systems Thinking Loop or "ST Loop" is the loop where mental models undergo an evolutionary algorithm by testing against Reality and receiving feedback in the form of Information (I) that then get formed using DSRP into a new mental model (thus changing the mental model and creating Learning). The ST Loop is the algorithm for not only ST but for Science writ large, and human learning.
In the animation below, the ST Loop is the first step. The next step involves understanding how our mental models are made up of information and thinking (DSRP structure) (e.g., m= i x t). The third step further explores the DSRP structure and Information.
Or alternatively this one: