Responsibility-driven design is another term for the process of allocating roles and duties to various participants in a program.
In the Unified Modeling Language, a collaboration diagram—also called a communication diagram—illustrates the connections and interactions between software elements (UML). These diagrams may be used to define each object's function as well as the dynamic behavior of a specific use case. Each variable (and every other named thing) in most programming languages has a defined scope that can change inside a particular program. The section of the program's text for which a variable's name has significance and for which it is considered to be "visible" is known as the variable's scope.
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