Prism
https://docs.microsoft.com/en-us/previous-versions/msp-n-p/ff648465(v=pandp.10)
Prism provides guidance to help you more easily design and build, flexible, and easy-to-maintain client business apps that run on Windows Runtime, Windows Presentation Foundation (WPF) desktop, Silverlight, or Windows Phone 7. These apps may start small and evolve over time.
Using design patterns that embody important architectural design principles, such as separation of concerns and loose coupling, Prism helps you to design and build apps that embody significant presentation and business logic that typically interact with back-end systems and services and, using a layered architecture, may be physically deployed across multiple tiers. It is expected that the app will evolve significantly over its lifetime in response to new requirements and business opportunities. In short, these apps are "built to last" and "built for change." Apps that do not demand these characteristics may not benefit from using Prism.