In Waterfall, the next phase typically cannot be started until the previous one has been completed. The goal is to gather and analyze all the detailed requirements early in the process so that a complete solution can be architect-ed and build with highly predictable results.
Waterfall development can work well for complex or mission-critical systems or for and for organizations that require the highest levels of fault tolerance such as the military or aerospace. It provides a disciplined approach to assigning tasks and responsibilities within a development organization. Its goal is to ensure the production of high-quality software that meets the needs of its end-users, within a predictable schedule and budget.
Software projects that use RUP divide the project time-line into four consecutive phases. Elaboration, where requirements are specified in detail, architecture is validated, the project environment is further defined and the project team is configured.
Construction, where the software is built and tested and supporting documentation is produced. Transition, where the software is system tested, user tested, reworked and deployed. Each phase is concluded with a well-defined milestone e—a point in time at which certain critical decisions must be made and therefore key goals must have been achieved. Iterations occur in each phase. Activities in iterations are focused on one of the four activities: gathering requirements, analyzing, designing, implementing, and testing.
Each of these activities place a more or less important role as the project moves from phase to phase. RUP also defines the roles and activities of team members in-depth and relies at each stage on the production of visual models, which are rich graphical representations of software systems, and specific use cases rather than the large amounts of documentation required for each stage of Waterfall.
All team members have access to the same large knowledge base of guidelines, templates, tools, and other items to ensure that they share the same language and perspective on the project. Proponents stress that it enhances team productivity by providing each team member with guidelines, templates and tool mentors for all critical development activities.
While critics consider it to be too heavy, sighting the large number of documents and other artifacts that must be created to successfully adopt RUP properly. It is easy to find resources and skills and has many advantages over traditional waterfall approach. Questions 4. Answers Best Answers Vote Up 0 Vote Down. Unlike the one seen in Waterfall model, the other two accept the late inclusion requirements.
But I think, Agile is better than other two. About Paul jolie. Questions 2. Regarding Agile Software Development concept and estimates Previous. Steps needed to supply and process goods and services in Case Diagram Next.
RUP uses the term 'generation' to indicate another full cycle of development e. Another major difference was that RUP pushed the concept of Visual Models especially UML as deliverable artifacts which described the requirements, high and class level design and in some cases code generation was possible from detailed UML models , whereas Waterfall artifacts were typically very document heavy e.
Another difference was in the approach to commercial engagement. Waterfalls typically promoted the concept of a 'contractual' Software Requirement or Software Specification document, which defined the deliverable functionally, and non-functionally , and from which a project budget or fixed price transaction would be based.
Instead, RUP promoted budgeting at a per-phase basis, e. In many software development operations, Agile processes have superseded both Waterfall and RUP, although many of the artifacts and learnings of Waterfall and RUP remain. Agile has the primary benefit of breaking work down into much smaller chunks typically 2 week sprints, instead of months-long RUP phases or year-long waterfall projects.
This quick turnaround allows features to be delivered on a cost vs priority basis, is better adapted to ever-changing requirements, and allows obstacles to success to be identified much sooner than either Waterfall or RUP. Agile also cuts out a lot of the waste - lets face it, only a small percentage of developers ever read detailed specification documents or pore over detailed UML diagrams.
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