MVC Pattern
Introducing Cairngorm for Flex 3
Călin Iepure, calin.iepure@gmail.com

PL, BL, DL… 
Business Applications consists of:
 Presentation Layer (PL)
 Business Logic (BL)
 Data Layer (DL)
When PL, BL & DL are collapsed into one object
in Rich User Interface, it can lead to some of the
following problems:
 Difficult to use data outside that object
 Hard to change UI
 Hard to use multiple views of the same data

MVC Pattern
 Model – View – Controller is an architectural
model used in Software Engineering
 MVC is most commonly used to create interface
for software applications and consist in three
elements:
 Model: application data + logic to manage the state
of application
 View: present the user interface
 Controller: handles the user inputs to change the
state on the application