My Aha moment came when I built my first toy application using a layer approach. The data access layer, the business logic layer, and the UI. That moment came w

My Aha moment came when I built my first toy application using a layer approach. The data access layer, the business logic layer, and the UI. That moment came when I realized how these things come together. This is such a powerful concept; to successfully build a complex application requires the ability to integrate simpler abstractions.