Illustration of the 4+1 Architectural View Model. 4+1 is a view model used for "describing the architecture of software-intensive systems, based on the use of multiple, concurrent views".[1] The views are used to describe the system from the viewpoint of different stakeholders, such as end-users, developers, system engineers, and project managers. The four views of the model are logical, developme
![4+1 architectural view model - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/f9d3481945434845b501e2a9a73ca514a1c230cd/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2Fe%2Fe6%2F4%252B1_Architectural_View_Model.svg%2F1200px-4%252B1_Architectural_View_Model.svg.png)