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Spiral Model SDLC: How Does it Work?

Oct 27, 2022  |  

Spiral Model is one of the models for organizing working process of a software project. The Spiral model SDLC, like the Waterfall, Agile, Iterative, V-Shaped, and Bing Bang models, tries to reduce potential risks while raising the odds of success of the product.

'What makes the Spiral Model SDLC different from the others?' What major benefit does it have up its sleeve?

What Is Spiral Model SDLC?

A Spiral model SDLC is a highly structured method to software development that combines the Waterfall and Iterative models. Let's look at the Waterfall and Iterative models first to have a better understanding of how Spiral works.

Software development is carried out in a linear way using the Waterfall model, and the team must complete one stage before moving on to the next. Furthermore, the scope of the project is specified prior to the start of the project at the Requirements stage.


The Iterative Model is a more sophisticated idea. The model begins with the team specifying and producing only a portion of the software product, which is designed to eliminate the weaknesses of Waterfall. After that, the product is brought to life in iterations, which are phases with specified tasks and deadlines. With the Iterative model, teams may successfully and simply identify risks at the earliest stages. As a result, the team's chances of facing hazards in the future are small, if at all.

As a result, the Spiral Model SDLC uses a combination of the Waterfall approach and the Iterative model's repeated structure to make software development more adaptable for projects with stringent beginning scopes. It also allows for the management of hazards at any step.

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What Are the Phases of a Spiral Model SDLC?

Let's take a closer look at the Spiral Model SDLC and how it functions. Each stage of growth comprises four phases:

Planning

The team must now evaluate the demands to see if they are feasible. If they are, the teams begin the development stage by planning.

Risk Analysis

The team takes careful note of any potential issues that may occur on the stage in question, as well as potential solutions to those issues.


Construct or Build

At each spiral, the Construct phase relates to the production of the real software product. In this phase of the baseline spiral, while the idea is just being thought of and the design is being developed, a POC (Proof of Concept) is created to collect user feedback.

Then, when the requirements and design specifics become clearer, a functioning model of the software known as a build is created with a version number. These prototypes are submitted to the buyer for review.

Development

The experts in charge of the stage get to work after everything has been planned and considered.

Evaluation

When the stage is completed, the customer evaluates the outcome and provides comments to the team.

The team goes through each of these phases for every development stage, whether it's development, prototyping, or testing. This is a process that is repeated numerous times during the project engineering process. This distinguishes the Spiral Model SDLC from other models.

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What Are the Benefits of Using a Spiral Model SDLC?

We've already looked at how the Spiral Model SDLC works; now let's look at its primary benefits:

  • Customers can provide input at any time during the development process.
  • The model allows for more accurate cost estimation.
  • Possibility of adding new functionality in the future.
  • Risks are easier to handle than with certain other methods.
  • Creates a realistic image of the project.

What Are the Drawbacks of Using a Spiral Model SDLC?

Spiral, like any other model, has drawbacks, but the sole one is that it is best suited to particular types of projects:

  • There's a chance the project will be completed late and over budget.
  • Successful risk analysis necessitates a high level of skill.
  • For modest projects, it can be prohibitively expensive.
  • The documentation is extensive and must be carefully followed.

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Who Uses a Spiral Model SDLC?

One of the most fascinating aspects of the Spiral model SDLC is that it was utilized by Microsoft to create early versions of Windows. The approach was also used to create the Gantt chart software. As a result, it's no surprise that Spiral Model is chosen for large, high-risk initiatives that are also aimed at a broad audience.

The Spiral approach is also used in the game development business. As previously said, the approach enables thorough and rapid prototyping. Spiral becomes a viable option because the gaming business mainly relies on early game versions. With the model, game development companies may quickly receive client feedback and produce a playable that can quickly expand into equally fun games.

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When Should You Use the Spiral Model SDLC?

We've previously identified the Spiral Model SDLC's weak and strong areas; now it's time to see if this model is right for your project. If you answered yes to these questions, this model is a wonderful fit for you.

  • Is your project a low, medium, or high-risk endeavor?
  • Are you working on a large project?
  • Is it necessary to assess the project's risk and costs?
  • Do you have any prototypes that you need to make?
  • Is it possible that your project will change?
  • Do you require your project to be able to respond to changes in the environment?

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Summary of Spiral Model SDLC Benefits and Drawbacks

In conclusion, the Spiral Model SDLC is an alternative for large projects where every possible risk must be considered, and when the team and the client have agreed in advance that not every stage will be completed on time. Spiral overcomes another important difficulty for large, tightly regulated projects, in addition to extensive risk management: it allows for the addition of additional features later in the project. While Spiral is not Agile, clients can offer input after each stage and engage with the team on a frequent basis to ensure the project stays on course.

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