Ans (4) : Dynamic form is responsive if it reacts to stimuli. It is relevant to interactivity as the system needs to be responsive to give feedback to user. Behaviour is also relevant and it's easier to look at the shadow example shown in class to explain the relevance. The shadow has behaviour such as backing away and going up to hug people. Simulation forms the environment in which interaction takes place. Eg. An interactive game of flight simulation. Adaptation is the ability to change and it's also relevant because truly interactive system should not be reiterating the same results everytime. Which is why I'll rank adaptation as the most important factor.