SDLC RAD Model https://www.tutorialspoint.com/sdlc/sdlc_rad_model.
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SDLC RAD Model https://www.tutorialspoint.com/sdlc/sdlc_rad_model.htm
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The RAD (Rapid Application Development) model is based on prototyping and iterative
development with no specific planning involved. The process of writing the software itself
involves the planning required for developing the product.
Rapid Application Development focuses on gathering customer requirements through
workshops or focus groups, early testing of the prototypes by the customer using iterative
concept, reuse of the existing prototypes (components), continuous integration and rapid
delivery.
Rapid application development is a software development methodology that uses minimal
planning in favor of rapid prototyping. A prototype is a working model that is functionally
equivalent to a component of the product.
In the RAD model, the functional modules are developed in parallel as prototypes and are
integrated to make the complete product for faster product delivery. Since there is no
detailed preplanning, it makes it easier to incorporate the changes within the development
process.
RAD projects follow iterative and incremental model and have small teams comprising of
developers, domain experts, customer representatives and other IT resources working
progressively on their component or prototype.
The most important aspect for this model to be successful is to make sure that the
prototypes developed are reusable.
RAD model distributes the analysis, design, build and test phases into a series of short,
iterative development cycles.
Following are the various phases of the RAD Model −
The business model for the product under development is designed in terms of flow of
information and the distribution of information between various business channels. A
complete business analysis is performed to find the vital information for business, how it can
be obtained, how and when is the information processed and what are the factors driving
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successful flow of information.
The information gathered in the Business Modeling phase is reviewed and analyzed to form
sets of data objects vital for the business. The attributes of all data sets is identified and
defined. The relation between these data objects are established and defined in detail in
relevance to the business model.
The data object sets defined in the Data Modeling phase are converted to establish the
business information flow needed to achieve specific business objectives as per the business
model. The process model for any changes or enhancements to the data object sets is
defined in this phase. Process descriptions for adding, deleting, retrieving or modifying a
data object are given.
The actual system is built and coding is done by using automation tools to convert process
and data models into actual prototypes.
The overall testing time is reduced in the RAD model as the prototypes are independently
tested during every iteration. However, the data flow and the interfaces between all the
components need to be thoroughly tested with complete test coverage. Since most of the
programming components have already been tested, it reduces the risk of any major issues.
The following illustration describes the RAD Model in detail.
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The traditional SDLC follows a rigid process models with high emphasis on requirement
analysis and gathering before the coding starts. It puts pressure on the customer to sign off
the requirements before the project starts and the customer doesn’t get the feel of the
product as there is no working build available for a long time.
The customer may need some changes after he gets to see the software. However, the
change process is quite rigid and it may not be feasible to incorporate major changes in the
product in the traditional SDLC.
The RAD model focuses on iterative and incremental delivery of working models to the
customer. This results in rapid delivery to the customer and customer involvement during
the complete development cycle of product reducing the risk of non-conformance with the
actual user requirements.
RAD model can be applied successfully to the projects in which clear modularization is
possible. If the project cannot be broken into modules, RAD may fail.
The following pointers describe the typical scenarios where RAD can be used −
RAD should be used only when a system can be modularized to be delivered in an
incremental manner.
It should be used if there is a high availability of designers for modeling.
It should be used only if the budget permits use of automated code generating tools.
RAD SDLC model should be chosen only if domain experts are available with
relevant business knowledge.
Should be used where the requirements change during the project and working
prototypes are to be presented to customer in small iterations of 2-3 months.
RAD model enables rapid delivery as it reduces the overall development time due to the
reusability of the components and parallel development. RAD works well only if high skilled
engineers are available and the customer is also committed to achieve the targeted
prototype in the given time frame. If there is commitment lacking on either side the model
may fail.
The advantages of the RAD Model are as follows −
Changing requirements can be accommodated.
Progress can be measured.
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Iteration time can be short with use of powerful RAD tools.
Productivity with fewer people in a short time.
Reduced development time.
Increases reusability of components.
Quick initial reviews occur.
Encourages customer feedback.
Integration from very beginning solves a lot of integration issues.
The disadvantages of the RAD Model are as follows −
Dependency on technically strong team members for identifying business
requirements.
Only system that can be modularized can be built using RAD.
Requires highly skilled developers/designers.
High dependency on modeling skills.
Inapplicable to cheaper projects as cost of modeling and automated code generation
is very high.
Management complexity is more.
Suitable for systems that are component based and scalable.
Requires user involvement throughout the life cycle.
Suitable for project requiring shorter development times.
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