RAIL is a model for breaking down a user’s experience into key actions. It provides a structure for thinking about performance, so that designers and developers can reliably target the highest-impact work. The RAIL model is a lens to look at a user’s experience with a website or app as a journey comprising individual interactions. Once you know each interaction’s area, you will know what the user
![Introducing RAIL: A User-Centric Model For Performance — Smashing Magazine](https://cdn-ak-scissors.b.st-hatena.com/image/square/5fdda5304de468ecb7ef09b6701430d5f0c9c598/height=288;version=1;width=512/https%3A%2F%2Farchive.smashing.media%2Fassets%2F344dbf88-fdf9-42bb-adb4-46f01eedd629%2Fdee7fcc2-a3b4-4091-bc30-9b68fb3703dc%2Frail-intro.png)