A sequence diagram is a graphical view of a scenario that shows object interaction in a time-based sequence—what happens first, what happens next. Sequence diagrams establish the roles of objects and help provide essential information to determine class responsibilities and interfaces.
Sequence diagrams are normally associated with use cases. This type of diagram is best used during early analysis phases in design because they are simple and easy to comprehend. A sequence diagram has two dimensions:. Typically, vertical placement represents time and horizontal placement represents different objects.
A collaboration diagram is an interaction diagram which shows the sequence of messages that implement an operation or a transaction. These diagrams show objects, their links, and their messages. They can also contain simple class instances and class utility instances. Each collaboration diagram provides a view of the interactions or structural relationships that occur between objects and object-like entities in the current model. State chart diagrams model the dynamic behavior of individual classes or any other kind of object.
They show the sequences of states that an object goes through, the events that cause a transition from one state or activity to another, and the actions that result from a state or activity change. State chart diagrams are closely related to activity diagrams. The instructions below will guide you to the IBM License Key Center, and the on-line service for generating and managing your license keys. You can find the answers to many common licensing questions and maintenance renewal in the IBM support knowledge base.
You can easily find articles about licensing by navigating to the IBM Support Community and searching for 'Rational licensing' in the search box. Rational Machines was founded by Paul Levy and Mike Devlin in to provide tools to expand the use of modern software engineering practices, particularly explicit modular architecture and iterative development.
First released in , the Rational Environment was an integrated development environment for the Ada programming language, which provided good support for abstraction through strong typing. Its goal was to provide the productivity benefits associated with academic single-user programming environments to teams of developers developing mission-critical applications that could execute on a range of computing platforms.
The Rational Environment was organized around a persistent intermediate representation DIANA , providing users with syntactic and semantic completion, incremental compilation, and integrated configuration management and version control. To overcome a conflict between strong typing and iterative development that produced recompilation times proportional to system size rather than size-of-change, the Rational Environment supported the definition of subsystems with explicit architectural imports and exports; this mechanism later proved useful in protecting application architectures from inadvertent degradation.
The Environment's Command Window mechanism made it easy to directly invoke Ada functions and procedures, which encouraged developer-driven unit testing. The Rational Environment ran on custom hardware, the Rational R, which implemented a high-level architecture optimized for execution of Ada programs in general and the Rational Environment in particular. The horizontally-microprogrammed R provided two independent bit data paths, permitting simultaneous computation and type checking.
But do not forget The best UML modeling tool is whiteboard You can make your walls agile modeling enviroments with some cheap products:. They allow you to catch modelling errors, and more importantly, allow you to refactor models more easily.
Say your 'Customer' class has been renamed 'Account' - change it in the model and all references to Customer will be updated.
Remember -a good UML model is a bit like a circuit diagram - it has rules that allow you be very precise about what you want to convey. There are approaches to modelling that mean you generate the application rather than code it directly or code very little of it. What are you trying to achieve with your UML diagrams? This might help people answer your question more precisely.
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