acts not good or not so you need to have some model of what your actions affect so what you do is you have some experience you build models like scientists you know of your experience then you hope these models are roughly correct and then you use these models for prediction and the model is sorry to interrupt the model is based on your perception of the world how your actions will affect our world that's not so what is the important part but it is technically important but at this stage we can just think about predicting say stock market