How to Measure Interaction Events

I think it's great for anyone out there with a website with interaction. If you aren't keeping track of interaction events, you have holes in your data and you don't know what you're doing. And take a lesson from retail here. Do they keep adding more stuff to the window over the course of the year and not taking stuff out? Or do they change the whole window out? The merchandises that put that window together know what stuff is selling,. So they make every square inch of that window work for its money.