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RUP (Rational Unified Process, Unified Software Development process, Unified Software process) is an object-oriented and web-based programming methodology.

RUP summarizes six pieces of software development experience, also known as "best practices".

(1) iterative development

In general, the use of linear sequential development can not address customer needs. In fact, the problem we often encounter is that requirements often change throughout the software development project. Iterative development allows requirements to change during each iteration, deepening the understanding of the problem through a series of refinements.

(2) Management requirements

Before developing the system, it is impossible for the developer to fully explain the real requirements of a system, and determining the requirements of the system is a continuous process. RUP describes how to extract, organize, and document system functions and constraints, and the use of use cases and scripts has proved to be an effective way to capture functional requirements.

(3) Architecture

Components make software reuse possible, and RUP describes how to design a software architecture that is flexible, adaptable, easy to understand, and conducive to reuse.

(4) Visual modeling.

RUP and UML are linked together to establish a visual model of the software system in the development process, which can help people improve their ability to manage software complexity.

(5) verify the quality of software.

In RUP, software quality assessment is no longer a separate activity carried out after the event or by a separate team, but all the activities built into the process, so that defects in the software can be found early.

(6) change of control software

RUP describes how to control, track and monitor changes to ensure the success of the iteration.

RUP software development lifecycle is a two-dimensional lifecycle model.

RUP has 9 core workflows and 6 core engineering processes. 3 core support workflow. Its basic tasks are business modeling, requirements, analysis and design, implementation, testing, deployment, configuration, project management, and environment.

In the working stage, it is divided into initial stage, refinement stage, construction stage and transfer stage.

RUP iterative development

Each phase in RUP can be further broken down into iterations. An iteration is a complete development cycle that produces an executable product version and is a subset of the final product, which evolves incrementally from one iterative process to another to become the final system. Traditionally, projects are organized sequentially through each workflow, with each workflow only once, known as the waterfall life cycle (see figure 2). The result is that by the time the end-of-implementation product is completed and testing begins, there will be a large number of hidden problems left over during the analysis, design, and implementation phases, and the project may have to stop and start a long error correction cycle.

A more flexible and less risky approach is to go through different development workflows multiple times to better understand the requirements, build a robust architecture, and eventually deliver a series of step-by-step versions. This is called an iterative life cycle. Each sequential pass in the workflow is called an iteration. The software life cycle is iterative continuity, through which the software is incremental development. An iteration includes development activities to generate an executable version, as well as other auxiliary components necessary to use this version, such as version descriptions, user documentation, and so on. So a development iteration is in a sense a complete process of all workflows, which at least include: requirements workflow, analysis and design workflow, implementation workflow, and test workflow. It itself is like a small waterfall project.

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