Build your own CAB Part #1 - The Preamble（Jeremy D. Miller）

[http://codebetter.com/blogs/jeremy.miller/archive/tags/Build+your+own+CAB/default.aspx]

UI is quite important, you should not neglect it

important: make a big deal of care to protect the system from garbage input.

easy to change：many changes more frequently then requirement

takes time：event driven model, lots of external dependence; hard for testing, lots of bugs and take time to fix.

So it worths the time to build good UI: testable, splits up the concerns and responsibilities of UI.

So many responsibilities that UI takes:

presentation to user

catch user event

input, authentication validation and business rule

customization

UI navigation and synchronization between UI widget and business object

interaction with other parts of application