I hate to be the one to break it to you, but User Experience Design doesn’t end when you ship your product. Even if you do everything else in this book right, you still won’t know what your actual user experience is going to be like until you have a real product in the hands of real users.

In the first two sections, we talked about validating your ideas, understanding your customers, creating designs, and avoiding waste.

This last section deals with Lean methods of understanding and improving the real customer experience of your product, as well as some ways to improve your own development process.

Of course, the section is going to cover metrics. Metrics are at the heart of Lean Startup and Lean UX. This section will talk about ways to measure design intelligently and not fall into some dangerous data traps.

This section also goes into some general-purpose tips for making your entire team more Lean and efficient. It may not be immediately clear how that relates to UX, but in my experience, Agile, iterative, efficient teams create better user experiences every time.