| Summary: | A major problem in today software development and evolution is the mismatch between the structure of user requirements and software artifacts. User requirements are expressed in terms of functionalities. Software artifacts are expressed in terms of constructs such as class, attribute, operation, etc. As a result, it is not possible to separately and independently specify software artifacts that implement coherent functionalities. This affects the software reusability adversely. As requirements for changes are usually directed to functionalities, the lack of the correspondence is also a major barrier for software evolution. To address these problems, Dr. Tan proposed a novel representation, Data Flow Net (DF Net), which addresses the problem.
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