What is Spiral Model of Software Development? [A Complete Process]

Looking to build complex software and want to learn about the spiral model to mitigate risks?

Then read this complete guide where we discussed the spiral model of software development in detail. With this guide, you will get to learn about:

  • Software development life cycle (SDLC) methodology of the spiral model
  • 4 different phases of the spiral model
  • Advantages and limitations of using the spiral model for software development
  • When to choose spiral model

So without any further ado, let’s start.

What is the Spiral Model in Software Development?

The spiral model is a development process method in software engineering used to develop large and high-risk projects. The spiral model is the combination of iterative and waterfall models.

To understand the spiral model, you must know the iterative and waterfall models.

Iterative model – It is a methodology used to start the development of a project with initial requirements, and iteratively enhances the features until the project gets complete.

Waterfall model – It is a development method used to execute project development in a linear and sequential approach.

It is a kind of incremental model that focuses on risk analysis, where a software project repeatedly passes through 4 different phases.

Which are the four different phases in the spiral model?

  • Step 1. Planning
  • Step 2. Risk analysis
  • Step 3. Engineering
  • Step 4. Evaluation

The baseline spiral is the starting phase where planning is done according to the tailored needs, and risk is assessed. Then, each subsequent spiral is built on the baseline spiral and goes through each development phase to integrate the requirements.

Later, the software development team continue to add functionality in every-increasing spirals until the last production phase.

Check the well-explained image of the spiral model below.

Spiral Model Phases

Let’s understand the functioning of the spiral model. As a leading software application development company, we have experience in creating complex and larger applications. Based on our experience we have given an easy example to learn why it is an essential part of the software development life cycle.

Suppose you want to add some functionality at the last stages of software project development. At first, you might find it difficult to add new functionality because of the complexity and the ability to bring risks along with it. However, using the spiral model, you can make the whole software development process transparent as risk monitoring and regular expertise is its core characteristics.

Now, let’s understand the different phases of the spiral model to find how this spiral model functions.

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Which are the Different Phases of Spiral Model?

Each cycle of the spiral model is divided into 4 different quadrants, and the cycle is followed iteratively until the project is completed. In this section, we are discussing the functions of each quadrant.

  1. Requirement Analysis and Planning

  2. Initially, the business needs are gathered from the customers, and objectives are identified in the baseline spiral. Identifying possible alternative solutions is essential if attempted versions fail to perform. It also includes the identification of system, subsystem, and unit requirements through continuous communication between the system analyst and the client.

  3. Risk Analysis and Mitigation

  4. Risk analysis is performed to identify, estimate, and monitor any vulnerabilities and defaults in the possible solutions. Also, the risk mitigation strategy is planned and finalized upon confirmation. At the end of the quadrant, a prototype is made for the best possible solution.

  5. Designing and Development of Project

  6. In this step, identified features are developed and go through the testing process. It includes architectural design, design of modules, physical product design, and final design. Finally, the software is built and made available at the end of the third quadrant. To develop scalable and reliable software, you must hire software developers from a reputed development company like Space-O.

  7. Conducting Evaluation and Testing

  8. In the end, test results are evaluated to identify what actually worked and what did not. Also, it includes the planning for the next phase, which begins and the cycle continues.

What are the Advantages of the Spiral Model?

In this section, we are discussing the pros of using the spiral model. We have mentioned the top 4 advantages of the spiral model in detail. Have a look.

  1. Allows You to Handle the Project Risks Effectively

  2. The projects which are complex and large quite bring unknown risks during the software development process. Using the spiral model is the best choice among different software development methodologies because it does risk analysis, risk monitoring, and risk handling at every phase of the development process. The spiral model makes the whole process transparent as you can analyze risks from the beginning to avoid attacks and breakages.

  3. Decrease Risks by Preparing Strategy of Development

  4. It is advised to use the spiral model when the project is large and critical. The spiral model helps the project to divide into several parts to see the risks ahead of the software development process. You create a risk mitigation strategy and actually decrease risk management difficulties. Also, the spiral model has strong approval and documentation control to help you integrate additional functionality later in the process.

  5. Allows You to Evaluate to Increase Customer Satisfaction

  6. The spiral model involves customer feedback. This means the software which is built for the customers can actually evaluate the product in every phase or early stages of the software development process. This model helps developers to save development time and money by making changes beforehand.

  7. Provides Flexibility to Update Build As Per Requirements

  8. It is useful to incorporate requirements accurately at the intermediate phase of the software development process. You view the risks beforehand and devise a risk mitigation strategy to add additional functionalities.

This was all about the cons of the spiral model. Now, let’s discuss the cons of the spiral model.

Disadvantages of Spiral Model

Each model has its own share of limitations. Therefore, in this section, we will discuss the limitations of the spiral model. Let’s check.

  1. Longer Development Cycle Results in High Cost

  2. The spiral model is expensive as it involves various intermediate stages and requires an experienced software development team that can manage the process.

  3. Increases Dependency as Each Step is Analyzed Before Development

  4. Your project’s success will be highly dependent on the risk analysis phase. Therefore, the involvement of a professional needed who has wide experience in managing complex projects with risk assessments.

  5. Not for Smaller Projects

  6. As it requires a proficient software development team, the spiral model is quite expensive to use. Each phase of the spiral needs special monitoring to identify risks, which makes the whole process more complex. So it increases the cost to develop a software, and thus, it is not suitable for smaller software development projects.

  7. Involves High Complexity Due to Intermediate Phases

  8. High risk is associated with the spiral model as there is little possibility of falling behind schedule or going over budget while integrating additional functionalities. This increases documentation as it involves intermediate phases. Also, you are required to follow a strict protocol when using the spiral model.

After going through the pros and cons of the spiral model, now let’s check various scenarios where you can use the spiral model.

When to Use the Spiral Model

If you are unsure when to use this model, then check the following scenarios where it is advisable to use the spiral model.

  • The spiral model in software engineering is used when the project is large, requirements are complex, and you need evaluation to get clarity. For example, you want to create ERP software but you are unsure about the features needed for multiple roles in the software.
  • When requirements are unclear or complex, you might need to make significant changes during the software development cycle
  • When incremental releases are quite frequent and significant changes are expected from the development process
  • When you need customer feedback at each release to mitigate the risks at the early stages of the process during rapid development

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If you are still looking for more about the spiral development model, you need to check the following questions that throw some light on this model. Find out the top asked questions by the readers.

FAQs About Spiral Model

  1. What is the risk analysis phase?

  2. In this phase, a process is carried out to identify alternative solutions to mitigate risk and streamline the software development process. A prototype is built at the end of the risk analysis phase to ensure there is no risk found. And if found any, then the development team looks for alternate solutions to implement.

  3. What is risk handling in the spiral model?

  4. The spiral model is known for handling unknown risks that occur after the development process is started and might affect the successful completion of software. These risks are easily managed by developing a prototype at every phase of the software development.

Let’s Develop Your Enterprise Software

We hope this guide has helped to learn about the spiral model in detail. Now, it will be easy for you to choose this model in the most relevant scenario. You have learned four phases of the spiral model, the pros and cons of this model, along with the conditions when you use it.

In case you still have doubts or are not sure whether you should use the spiral model for your project or not, contact us with your requirements. Being a top software development company, we will help to build software with the best process model.

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Rakesh Patel

Written by

Rakesh Patel

Rakesh Patel is the Founder and CEO of Space-O Technologies. He has 28 years of IT experience in business strategies, operations & information technology. He has expertise in various aspects of business like project planning, sales, and marketing, and has successfully defined flawless business models for the clients. A techie by mind and a writer at heart, he has authored two books – Enterprise Mobility: Strategy & Solutions and A Guide To Open311.