Jargon can deliver an iterative approach to managing Data Models and APIs. Here’s an overview of what we’ll be going over in this post: It all starts with a plan — A Town Plan Although you can jump right in and create a Domain right away in Jargon — a Town Plan will help create cleaner, modular and more reusable domains. Town Planning is a fast and light weight way to play around with how your information will be architected.