Design Pattern In Software Engineering Design pattern in software develop are general, reusable solutions to the most acurring problem in designing software design. What are those problems? While designing of the system to face the scenarios where you have to decide which approach or method use to solve the problem. 1) Problem can be the structure of the system. 2) The flow of the data in the system. 3) The interaction between different modules in the same system. While developing the system you came to face with different problem. Now you have a developer team. You assign this task to these developer individually and every develop solve the problem according to its approach. Now question is which approach/solution is efficient rest of others. Now after analysis you decide If certain problem you face in developing software, solve it with that particular solution. Example If you want, at loading of the application you want to create single object and access each module/class data u...