Explore some of the most popular Flex and ActionScript 3.0 Architecture and Dependency Injection frameworks, such as Cairngorm, Mate, Parsley, PureMVC, Robotlegs, and Swiz. We’ll also discuss what each framework's pros and cons are and which framework makes sense when faced with different architectural designs. You'll also learn which architectural patterns (like Model-View-Controller and Presentation Model) are considered popular in current application design.