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While improvements in tools and frameworks make it easier to write code more quickly, and modern languages and programming styles make it easier to write better code, the one area that has had the most impact on our ability to create applications over the last 10 to 15 years has been the evolution and increasing acceptance of software design patterns.

Design patterns describe common issues that occur repeatedly in application design and development and provide techniques for handling these issues. Patterns also describe the current industry practice for resolving architectural issues and for handling the design complexity demanded of applications. The arrangement of code and solution elements is at the heart of software design today, and patterns provide us with ways to simplify and organize these elements—providing the best opportunity to maximize performance, flexibility, and maintainability for applications.

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