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The incremental model is like multiple waterfall models divided into smaller cycles. This is done by working in versions, where new functionalities are added in each new version.

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RAD is model is based on prototyping without any specific planning.  It focuses on gathering customer requirements through customer feedback, early testing of the prototypes by the customer using iterative concept, reuse of the existing prototypes, continuous integration and rapid deliver.

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The picture shows one of Agile's methodology, called Scrum.
It represents a simple interlocking steps and components.

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Agile Methodology is a people-focused, results-focused approach to software development that respects our rapidly changing world.

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This model is more flexible, with low cost involved. As it is released in small builds it is easy to test and debug. Once a version is finished, a prototype can be released to the client.

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Pros:
- faster and smaller(phases like outlining the requirements, planning, design, building, testing, and delivery)

- communication (communication ensure the process stays on track even as conditions change, non-formal)

- feedback (stating a problem and finding out the properly solutions)

- trust (each member must understand their goals and create their own path to reach success)

- adjust/ keeping simple ( tuning and adjusting the process continually)

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to produce a product in a short span of time (2-3 months)

When the requirements are clear

When the user will be involved all through the life cycle

When technical risk is less

When the product requires flexibility and adaptability

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This model requires good planning and design. Total cost is higher than than the waterfall model. Not suitable for small projects.

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-The iterative process model is a cyclical process in which you make and test incremental adjustments. Teams gradually build up the features and functions but don’t wait until each of these is complete before releasing.
-Iterative development relies on a series of repetitive or cyclical loops in which you revise and improve a product based on feedback from users and stakeholders.

This model is most often used in the following scenarios:

Requirements of the complete system are clearly defined and understood.

Major requirements must be defined; however, some functionalities or requested enhancements may evolve with time.

There is a time to the market constraint.

A new technology is being used and is being learnt by the development team while working on the project.

There are some high-risk features and goals which may change in the future.

Advantages:

Some working functionality can be developed quickly and early in the life cycle.

Results are obtained early and periodically.

Progress can be measured.

Less costly to change the scope/requirements.

Testing and debugging during smaller iteration is easy

Disadvantages:

More resources may be required.

More management attention is required.

Not suitable for smaller projects.

End of project may not be known which is a risk.

Wikipedia relies on user-generated content that allows reviewers to add relevant information or delete content that is outdated or no longer useful. A wiki is never finished. In the iterative process model, the site continually evolves with new information.

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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.

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Microsoft uses Incremental models as they always need their users requirements so that they update their product. We have many versions of Microsoft Office products which are developed through Incremental model.

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Cons:
- Limited documentation
(it becomes less detailed and often falls to the back burner, end user's fault with not providing detailed information for the expected product)

- Difficult measurement
(The time is flexible. The product can be launched either before the deadline or after)

- Poor resource planning
(it's challenging to predict efforts like cost, time and resources required at the beginning of a project)

- Fragmented output
(The output/ result product can become very fragmented rather than one entire unit)

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Flexible and adaptable to changes

reduction of manual coding

useful when you have to reduce the overall project risk

prototyping in nature, there is a possibility of lesser defects

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It can’t be used for smaller projects

When technical risk is high, it is not suitable

Progress and problems accustomed are hard to track as such there is no documentation to demonstrate what has been done

Reduced features due to time boxing, where features are pushed to a later version to finish a release in short period

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- restaurant orders

Preparation of some of the food before opening the shop (sprint planning)

continuous delivery of orders (ad-hoc stories)

number of successful orders (velocity)

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“97% of firms have started with their Agile methodology practices in 2019”

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One of the best rapid application development tools on the market, Kissflow is a complete business process management suite designed to let you create your own processes and workflows, or customize pre-built templates according to your needs.

- easy to use for everyone.
-got a single sign-on feature, allowing you to work from anywhere and using any device.
-compatible for iOS and android
-comes with built-in advanced reporting and analytical tools give you all the information you need.
-the ability to integrate with third-party tools using Zapier. So, if you like using a particular tool, Kissflow will seamlessly integrate with it, without needing any additional coding.

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 Agile is being used in so many organizations in various fields. That includes IT, banking (AIB bank online account security), entertainment etc.

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 Agile is being used in so many organizations in various fields. That includes IT, banking (AIB bank online account security), entertainment etc.

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The OG of Software Development Life Cycles - created in 1970.
Also known as the Linear Sequential Model.
As the name suggests, this model follows a linear sequence; 1,2,3,4... etc.
Each part of the sequence is completed and reviewed before the next section of sequence is initiated.

Stages:
Analysis - Requirements for the product to be set out and developed. The Requirement Specification Document (RSD) is written up.
Design - Using the RSD, the system requirements are assessed and hardware is specified for use. This stage helps inform the overall system architecture.
Implementation - Using the system design, each element of the product (Unit) is developed and tested independently for functionality.
Integration/Testing - Each unit that has been developed in the previous stage are integrated into the system. Once all the pieces assembled, then a full test of the system can be performed.
Maintenance - Following successful final testing, the product is now up and running and will need to be maintained. This includes troubleshooting any issues that arise, providing fixes and upgrades where and when required.

Advantages:
- Logical
-  Straightforward approach, which is beneficial to new team members
- There is something to show the client after each phase is completed.
Disadvantages:
- (Slow) relies upon the completion of a previous stage before the next can begin
- Not suitable for larger complex projects.

Real World Example:
Toyota currently use this model for production development.