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The spiral model is a risk-driven software development process model. Based on the unique risk patterns of a given project, the spiral model guides a team to adopt elements of one or more process models, such as incremental, waterfall, or evolutionary prototyping What is a data flow diagram (DFD)? A picture is worth a thousand words. A Data Flow Diagram (DFD) is traditional visual representation of the information flows within a system. A neat and clear DFD can depict a good amount of the system requirements graphically. It can be manual, automated, or combination of both. Tutorialspoint uml. During the design phase, software artifacts classes, interfaces, etc. Class diagrams basically represent the object-oriented view of a system, which is static in nature. In forward engineering, use case diagrams are used to make test cases and in reverse engineering object?oriented software engineering using UML - Draws on the best features and characteristics of conventional software process models - Emphasizes the important role of software architecture - Consists of a process flow that is iterative and incremental, thereby providing an evolutionary feel Software Engineering Department of Computer Science Technische Universitat Darmstadt Introduction to Software Engineering System Sequence Diagrams The following slides make extensive use of material from: Applying UML and Patterns, 3rd Edition; Craig UML Models and Diagrams []. The Unified Modeling Language i