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The document outlines the principles and practices of Object-Oriented (OO) application development using VB .NET. It introduces key concepts such as object-oriented analysis, design, and programming, emphasizing the benefits of OO development like naturalness and reuse. The text is structured into five parts, covering fundamentals, problem domain classes, graphical user interface classes, data access classes, and the integration of these components in a three-tier design approach.

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