When developing software from scratch, software engineers must follow a set of steps known as software development cycles. This article will look at eight different software development life cycles (SDLCs) that are widely used around the world. Generally, the SDLC process includes six steps:
1. Requirement analysis
2. UI/UX Design
3. Software development
4. Testing and Run Quality Assurance
5. Deployment of final code
6. Maintenance
The goal of developing SDLs is to assist engineers in producing high-quality software. The first common model we would like to introduce is the Agile Model.
1. Agile Model
Agile methods in the software development business are regularly compared with the 7 common different models. But it is regarded that an agile approach is best. It utilizes a gradual method to discuss with the customer a sample prototype. The prototype helps to grasp the main characteristics and demands. The next prototypes mirror the changes in the preceding prototypes. This continues until the client is happy and the customer receives a superior end result. The objective is to preserve the quality of the product throughout the development stage. 5 reasons below are explained why Agile is the winning model:
– Agile methodologies have surpassed the waterfall model’s traditional processes by becoming more flexible, quick, lean, responsive, and consistent.
– The Agile technique is more communication-oriented and focuses on people.
– Agile approaches are put to the test in a dynamic setting and show to be extremely adaptable to changes in the business.
– Regular inspection in a disciplined manner is a feature of agile approaches, which strengthens leadership characteristics and increases teamwork.
– The Agile technique adheres to best practices that aid in the rapid development of high-quality software.
The Agile Model is heavily reliant on cross-functional teams and the customer/user with its advantages & disadvantages:
Advantages: Reducing the amount of time required to produce individual system features.

Disadvantages: Because it relies on end-user interaction, which may or may not be clearly expressed, the Agile method has the potential to deviate from the path. Documentation is also kept to a minimum in an Agile software development strategy, which necessitates a well-versed, cross-functional team.

Agile models can be used in:
– Any startup initiative where early feedback from end users is essential.
– Medium-sized projects in the custom development phase, as well as their business requirements, are unable to be translated into detailed software requirements.
– Large-scale projects can be easily divided into small functional parts and developed gradually in each iteration.
Agile comes in different flavors. Today, its most common subtypes are Scrum, Extreme Programming, and Kanban.

2. Waterfall model

The Waterfall Model is a linear sequential flow that, as the name suggests, flows steadily downward through the phases of software implementation.

Advantages: A simple & understandable method ideal for lifecycle management of smaller projects where the requirements are established and finalized upfront.

Disadvantages: Its rigid structure does not work well for complex projects.

This model can be used in small and medium-sized projects with stricter controls, predictable budgets and timelines.

3. The V-Model

The V-Model, an extension of the Waterfall Model, also functions as a sequential flow. However, rather than moving in a straight line downward, the software development lifecycle bends upwards after the coding phase (for each of the testing phases).

Advantages: A straightforward process that is ideal for smaller projects. By its stage’s test plans and regularly scheduled updates throughout its lifecycle, using the V-Model has a higher chance of success. 

Disadvantages: Like the Waterfall Model, is very rigid in nature, making it unsuitable for applications or systems software that may require unforeseen changes/updates throughout the software lifecycle.
This model is appropriate for projects that require no errors or downtime, such as medical software or flight management software.

4. Incremental Model

The Incremental Model, designed to mitigate the shortcomings of the Waterfall Model, consists of iterative and incremental development stages, as well as several mini-Waterfall cycles.

Advantages: An excellent solution for projects that require some flexibility between increments. It helps to detect problems earlier in the process, allowing for better lifecycle management planning. 

Disadvantages: The need for strategic planning and documentation. This method also necessitates more resources, both human and financial, for the project. This model isn’t ideal for ongoing development because the next sequence can’t begin until the previous one is finished.

This model can be used in a large-scale and lengthy development project requiring basic functionality delivery quickly, such as microservices or web services.

5. The RAD Model

The RAD Model is a variant of the Incremental Model that is based on prototyping without any prior planning.

Advantages: The RAD Model reduces development time and allows for more customer feedback throughout the software development process.

Disadvantages: It is limited because the project must be easily modularized into several increments. It requires high skill developers, as well as excellent modeling and planning abilities. Issues with the final assembly of components may result in unanticipated setbacks and the need to redevelop components to properly fit the rest.

This model can be used in the following situations: A project requires you to complete it quickly. You have a large budget and a large pool of users to provide feedback on the prototypes.

6. Iterative Model

Rather than starting with full specification requirements, the Iterative Model relies on specifying and implementing individual parts of the software.

Advantages: When using this software development model, it is easy to identify problems early because the product is developed gradually.

Disadvantages: Because each iteration phase is rigid and does not overlap, the Iterative Model can take longer and be more expensive.

Iterative models can be used in the following situations:
– The system’s requirements are clearly defined and understood.
– Although major requirements must be defined, some functionalities or requested enhancements may evolve over time.
– There is a time limit.

7. Spiral model

In an attempt to combine the benefits of top-down and bottom-up production, the Spiral Model combines elements of both the Iterative and Waterfall development models.

Advantages: The Spiral Model can be beneficial because it manages risks and divides development into phases. It also aids in more accurate budget and schedule estimates because roadblocks are discovered earlier.

Disadvantages: Because this model is so customized, repurposing the process can be difficult. It also necessitates team members who are well-versed in risk assessment.
The typical uses of a Spiral Model: budget constraint, risk evaluation, long-term project, unsure requirements, complex project, new product line

8. Prototype model

The Prototype Model is based on creating prototypes of software applications or system software that are used to visualize various software components. It is used to close the gap between requirements and expectations by allowing for ample collaboration and feedback from the user.

Advantages: The Prototype Model can save time and money while involving the user heavily.

Disadvantages: This model may cause user confusion between the prototype and the finished product, and it may add unnecessary development time for prototype development.

Prototype model should be used:
– Online systems and web interfaces with a high level of interaction
– Prototyping ensures that end users interact with the system on a regular basis and provide feedback.

We can’t say which SDLC methodologies are superior; each one provides unique value for each project you’ll encounter in your career. As a result, finding the right one is critical. You can always contact Twendee for more information on software development life cycle methodologies.

We are proud to be the leading Vietnamese software development company in the Asian region. We can provide accurate advice on each model suitable for your projects, make it visible and focus on most valuable things because we have a team of experts who are proficient in various programming languages and have extensive development experience.

And if you’re curious about software development outsourcing rates, use our free consultant to determine the best pricing for your project.
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