Interaction is about understanding why. Whys make us wise! Why is this happening? What is causing it? Why am I being shown this? How does it relate to the other things I have seen? What are my mental models (my experience)? What can I find out from others? Who do I need to consult? (Stakeholders) We can use the tools of Systems Thinking to map out interactions in Causal Loop Diagrams. We can also use causal circles, stock/flow diagrams and icebergs to help.