Rational Unified Process

Object Oriented Design and Analysis
Rational Unified Process

Software Development Process
An approach to building, deployment, and
maintaining software.

Unified Process
• A iterative and incremental software
development process framework for building
object-oriented systems.
• Emerged as a popular software development
process

Iterative and evolutionary development
• An iterative and evolutionary approach allows start of
development with incomplete, imperfect knowledge
• Iterative and evolutionary have the following
advantages:
– Logical progress toward a robust architecture
– Effective management of changing requirements
– Continuous integration
– Early understanding of the system
– Ongoing risk assessment

Contd..
Requirements
Design
Implementation &
Test & Integration
& More Design
Final Integration
& System Test
Requirements
Design
3 weeks (for example)
The system grows
incrementally.
Feedback from
iteration N leads to
refinement and
adaptation of the
requirements and
design in iteration
N+1.
Iterations are fixed in
length, or timeboxed.
Time
Implementation &
Test & Integration
& More Design
Final Integration
& System Test

Contd..
Early iterations are farther from the "true
path" of the system. Via feedback and
adaptation, the system converges towards
the most appropriate requirements and
design.
In late iterations, a significant change in
requirements is rare, but can occur. Such
late changes may give an organization a
competitive business advantage.
one iteration of design,
implement, integrate, and test

Rational Unified Process
• A refinement of the unified process i.e. iterative software
development process.
• provides a disciplined approach to assigning tasks and
responsibilities within a development organization
• Goal - to ensure the production of high-quality software
that meets the needs of its end-users, within a predictable
schedule and budget

RUP
• Process
– Enhance team productivity
–Configurable
• no single process is suitable for all software
development
• adapts to small & large development teams
–Documentation
• Model based artifacts
• UML

RUP
• Building blocks
– Roles (who)
• responsibilities
– Tasks (how)
• Unit of work
• Result oriented – should be useful
– Work products (what)
• Resultant product

RUP Best Practices
how to effectively deploy commercially proven
approaches to software development for
software development teams
•Develop software iteratively
– not possible to
– define the problem upfront
– design the entire solution
– each iteration ends with a release
•Manage requirements
– use case to capture functional requirements
– should be traceable

Contd..
• Use component-based architectures
• Visually model software
– different models to communicate
• different aspects with different stakeholders
• UML

Contd..
• Verify software quality
– review
• functional requirements
• non-functional requirements
– should be part of the process
• Control changes to software
– continuous integration

RUP Process
• Two dimensions.
–Horizontal axis represents time and shows the
dynamic aspect of the process as it is enacted,
and it is expressed in terms of cycles, phases,
iterations, and milestones.
–Vertical axis represents the static aspect of the
process: how it is described in terms of
activities, artifacts, workers and workflows.

RUP - Two Dimensions

Phases and Iterations - The Time Dimension
• dynamic organization of the process along
time
• the software lifecycle is broken into cycles,
each cycle working on a new generation of the
product
– Inception phase
– Elaboration phase
– Construction phase
– Transition phase

RUP - Lifecycle Phases

RUP- Core Workflows

Inception objectives
• Establish software scope and boundary conditions.
– operational concept.
– acceptance criteria.
– descriptions of what is and what is not included.
• Discriminate critical Use Cases of the system.
– primary scenarios of behaviour.
• Exhibit at least one candidate architecture.
• Estimate overall cost.
• Estimate risks.

Inception activities
• Formulate scope of project
• Plan and prepare a business case and evaluate
alternatives for risk management, staffing,
project plan
• Synthesise a candidate architecture.

Outcome of inception
• A ‘vision’ document, i.e., a general vision of the core projects
requirements, key features and main constraints.
• A Use-Case model survey – all Use Cases and Actors that can
be identified so far.
• An initial project glossary.
• An initial business case including business context, success
criteria and financial forecast.
• Initial risk assessment.
• Project plan, with phases and iterations.

Other artifacts produced
• Initial Use Case model (10%-20% complete)
• A domain model static picture of scope.
• A business model (if necessary)workflow.
• A preliminary development case description to
specify the process used.
• One or several prototypes.
– Behavioral, Structural, Exploratory or Evolutionary.

Evaluation criteria at end
• Agreement on scope definition and cost and
schedule estimates
• Requirements understanding as shown by the
correctness of the primary Use Cases.
• Credibility of the cost and schedule estimates,
priorities, risks and development process.
• Depth and breadth of any architectural prototype
that was developed.
• Actual expenditure v planned expenditure.

Elaboration objectives
• To analyse the problem domain.
• Establish a sound architectural foundation.
• Develop the project plan.
• Eliminate high-risk elements.

Elaboration objectives
• Define, validate and agree the architecture as
quickly as possible.
• Agree the vision that came from the inception
phase.
• Agree a plan for the construction phase.
• Demonstrate that the architecture will
support this vision for a reasonable cost in a
reasonable time.

Elaboration activities
• The vision is elaborated and a solid
understanding is established of the most
critical Use Cases that drive the architectural
and planning decisions.
• The Process, the infrastructure and the
development environment are elaborated,
and the process, tools and automation
support are put into place.

Elaboration activities
• The architecture is elaborated and
components are selected.
– Potential components are evaluated.
– make / buy / reuse decisions determine the
construction phase cost and schedule.
– Architectural components integrated and
assessed against primary scenarios.
– This is done iteratively.

Outcome of elaboration
• Use Case model (at least 80% complete).
– All Use Cases identified.
– All Actors identified.
– Most Use-Case descriptions developed.
• Supplementary requirements.
– (non-functional or not associated with a Use
Case)
• Software architecture description.

Outcome of elaboration
• Executable architectural prototype.
• Revised risk list and revised business case.
• Development plan for overall project.
– coarse grained project plan, with iterations and
evaluation criteria for each iteration.
• Updated development case that specifies
process to be used.
• Preliminary user manual (optional).

• Is the vision of the product stable?
• Is the architecture stable?
• Does the executable demonstration show
that major risk elements are addressed?
• Is construction phase sufficiently planned?
• Do all stakeholders agree that current
vision is achievable, using current plan with
current architecture?
• Is the cost acceptable?

Construction
• All remaining components and application
features are developed and integrated into
the product.
• All features are tested thoroughly.
• Emphasis is placed on managing resources and
controlling operations to optimise cost, schedules
and quality.
• Parallel construction can accelerate the
availability of deployable releases.

Construction objectives
• Minimise development costs by optimising
resources and avoiding unnecessary scrap and
rework.
• Achieve adequate quality as rapidly as
possible.
• Achieve useful versions (alpha, beta or other
test releases) as rapidly as practical.

Construction activities
• Resource management, resource control,
process optimisation.
• Complete component development and
testing against the defined evaluation criteria.
• Assessment of product releases against
acceptance criteria for the vision.

Outcome of construction
• A product ready to put into the hands of end
users.
• The software product integrated on the
adequate platforms.
• The user manuals.
• A description of the current release.

• Often called the beta release, is it ready?
– Is the product release stable and mature enough to be
deployed in the user community?
– Are all stakeholders ready for the transition into the use
community?
– Are the actual resource expenditures v planned
expenditures still acceptable?
• Transition may have to be postponed by one release
if the project fails to reach this milestone.

Transition
• This moves the software project to the user
community.
• After release, issues usually arise that require new
releases, either to correct problems or finish features
that were postponed.
• This phase is entered when a baseline is mature
enough to be deployed in the end-user domain.
• This means that some usable subset of the system
has beem completed to an acceptable level of quality
and that user documentation is available.

Transition phase includes
• Beta testing to validate the new system against use
expectations.
• Parallel operation with the legacy system that the
project is replacing
• Conversion of operational databases.
• Training of users and maintainers.
• Rollout of the product to the marketing, distribution
and sales teams.
• It concludes when the deployment baseline has
achieved the completed vision.

Transition objectives
• Achieve user self-supportability.
• Achieve stakeholder concurrence that
deployment baselines are complete and
consistent with the evaluation criteria of the
vision.
• Achieve final product baseline as rapidly and
cost-effectively as practical.

Transition activities
• Deployment-specific engineering, i.e. cutover,
commercial packaging and production, sales rollout,
and field personnel training.
• Tuning activities, including bug fixing and
enhancement for performance and usability.
• Assessing the deployment baselines against the vision
and the acceptance criteria for the product.
• The activities depend on the goal
– For fixing bugs, implementation and testing are usually
enough.
– For new features, iteration is similar to construction phase.

• Is user satisfied?
• Are the actual resources expenditures v
planned expenditures still acceptable?

Thank you

Rational Unified Process

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Editor's Notes