Question

What are the most important patterns you should know, when developing testable n-tier line of business web applications?

• Repository pattern
• Model View Controller
• Dependency Injection Pattern
• Factory Pattern
• Singleton

What else?

Answer 1

“most” important?

The problem domain’s patterns — whatever they are. Accounts Payable, General Ledger, Accounts Receivable, Organizational Hierarchy.

http://www.businessanalysisbooks.com/0471295515.html

http://www.amazon.com/Analysis-Patterns-Reusable-Addison-Wesley-Technology/dp/0201895420

Technical patterns (MVC, Repository, etc.) are a dim second place.