The 12 factor App – Written by Adam Wiggins

http://12factor.net/

Introduction

In the modern era, software is commonly delivered as a service: called web apps, or software-as-a-service. The twelve-factor app is a methodology for building software-as-a-service apps that:

The twelve-factor methodology can be applied to apps written in any programming language, and which use any combination of backing services (database, queue, memory cache, etc)…

Credit:  Written by Adam Wiggins