Agile and Waterfall are both Software Development Lifecycle (SDLC) methodologies that have been widely adopted in the IT industry. Both Waterfall and Agile require organizations to follow certain operating principles—but the practice often departs from the principles.

Systems development life cycle phases include planning, system analysis, system design, development, implementation, integration and testing, and operations and maintenance.

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The software development lifecycle (SDLC) is a framework that development teams use to produce high-quality software in a systematic and cost-effective way. The SDLC methodology is used by both large and small software organizations.

There are usually six stages in this cycle: requirement analysis, design, development and testing, implementation, documentation, and evaluation.

The Waterfall model is the earliest SDLC approach that was used for software development. The waterfall Model illustrates the software development process in a linear sequential flow. This means that any phase in the development process begins only if the previous phase is complete.

RAD Model – Application 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 Modelling. It should be used only if the budget permits use of automated code generating tools.

2) What are the four phases of RAD software development? Requirements development, construction, cutover and maintenance.

Cutover: The last stage where all the independent developed modules are move to the live production, Here any full scale testing and team training is performed if required.

What is Rapid Application Development Methodology? RAD methodology is a software design methodology that’s designed to counter the rigidity of other traditional software development models–where you can’t make changes easily after the initial development is complete.

The Process Modeling phase is the step in the RAD model procedure where all the groups of information gathered during the Data Modeling step are converted into the required usable information. During the Process Modeling stage, changes and optimizations can be done, and the sets of data can be further defined.

The changes of requirements in later phases of the waterfall model cannot be done. This implies that once the software enters the testing phase, it becomes difficult to incorporate changes at such a late phase. No user involvement and working version of the software is available when the software is being developed.

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Definition: The Rapid Application Development (or RAD) model is based on prototyping and iterative model with no (or less) specific planning. The RAD model includes agile method and spiral model.

Discussion Forum

Although RAD and the agile methodologies share similar values, with regards to flexibility, shorter delivery time, and high customer interaction and satisfaction, RAD is primarily focused on prototypes while agile is mostly focused on breaking down the project into features which are then delivered in various sprints …

The main principle of the Spiral model is risk handling. The Agile model focuses on the delivery of an increment to the customer after each Time-box, so customer interaction is more frequent. Spiral model mainly deals with various kinds of unanticipated risks but customer interaction is less.

5 Key Disadvantages of Agile Methodology

• Poor resource planning.
• Limited documentation.
• Fragmented output.
• No finite end.
• Difficult measurement.

Using methods that focused on speed over deliberation, Rapid Application Development (RAD) tools provided developers with a way to create software quickly, efficiently, and without having to invest in huge development budgets.

Rapid Application Development (RAD) is a form of agile software development methodology that prioritizes rapid prototype releases and iterations. Unlike the Waterfall method, RAD emphasizes the use of software and user feedback over strict planning and requirements recording.

RAD should be used when there is a need to create a system that can be modularized in 2-3 months of time. It should be used if there’s high availability of designers for modeling and the budget is high enough to afford their cost along with the cost of automated code generating tools.

It also includes about serial or linear sequential, rapid application development and iterative development model along with the different phases involved in developing a software.