Separation of Concerns is a well-known concept in application architecture. Over the years, application structures have evolved from monolithic to modular, using techniques such as encapsulation and abstraction to reduce coupling and increase cohesion. The purpose of doing so is quite simple – it yields software systems that are easier to understand, change, and enhance.
See the full post on the Iasa Global Blog (a re-post, originally published here).
Form Follows Function 