spiral-model-software-engineering

Spiral Model (Software Engineering)

In the article, we will be talking about an important Spiral Model of software engineering. SDLC is an acronym that refers to the Software Development Life Cycle. SDLC is a procedure followed by a software project within a software company. It comprises a thorough plan for developing, maintaining, changing, or improving specific software. The life-cycle defines an approach for improving overall quality and performance and the entire development process.

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What exactly is Spiral Model?

We offer a variety of SDLC models. The Spiral model is among the most appropriate models for the risky task. The spiral model was created through Barry Boehm in his 1986 paper, "A Spiral Model of Software Development and Enhancement." The spiral model combines an iterative process development model and a sequential linear development model. The diagrammatic representation of it the model appears to be an intricate spiral with numerous loops.

Spiral Process - Georgia Tech - Software Development Process, Source: Youtube, Udacity

The precise number of loops in the Spiral isn't known and may differ from one project to another. Each loop in the Spiral is known as a Phase of developing software. The project manager can change the exact number of stages necessary to build the software based on the risk of the project. The project manager can determine the number of phases the project manager plays an essential job in creating an item with a Spiral Model. A Spiral Model is referred to as a Meta-Model since it is a subset of all models that are not SDLC models. For instance, a single loop spiral is known as the Iterative Waterfall Model. The coil model incorporates the stepwise method that is part of The Classical Waterfall Model. The spiral model follows the Prototyping Model's methodology by building a prototype at the beginning of each stage as an effective risk-handling method. Additionally, the model could be viewed as an evolutionary model-supporting system - the Spiral iterations can be considered in evolutionary levels on which the whole system is constructed.

Spiral Model Phases

The diagram below illustrates the various stages in the Spiral Model.

As depicted in the figure above, each part in the Spiral Model is divided into four quadrants. The purpose of these quadrants is described below.

Objectives to be determined and possible solutions

These requirements are gathered from clients, and the goals are identified, elaborated, and then analyzed at the beginning of each phase. This also involves knowing the requirements for the system by regular communication between the client and the analyst of the system. There are various solutions for this phase are suggested within this quadrant.

Recognize and address risks

Risk Analysis involves identifying and monitoring risk management and feasibility, like schedule slippage or cost overruns. Every possible solution is assessed in the second quadrant to determine the most effective feasible solution. The risks that come to the proposed solution are determined, and then the chances are dealt with using the most efficient method. After this quadrant, the Prototype is developed to be the most effective solution.

SDLC Spiral Model: Phases, Advantages, Disadvantages | Computer Science, Source: Youtube, TestPrep

Create your next product version

The features identified are created and validated through tests in the 3rd quadrant. The process could involve activities like benchmarking, simulation and prototyping. When you reach the 3rd quadrant, a new version will be accessible.

Review and plan the next step

When a cycle has been completed, the planning for the following process starts. The fourth quarter customers evaluate the as far-developed versions of software. Then, the plan for the next stage begins.

The development phase will be based on the risks remaining. For instance, if the users' interface risks or performance issues are considered more important than program development risks, The next step could be an evolution that involves developing an elaborate prototype to address the threat.

Risk Handling in a Spiral Model

Risk is any circumstance that could affect the success of the software project. The most significant feature in the model spiral is handling these risks that are not known until the project has begun. These risk resolutions can be achieved by developing an initial prototype. The spiral model permits the copying of risks because it allows you to create a prototype during each stage of software development.

RISK HANDLING IN SPIRAL MODEL, Source: Youtube, chander shekhar

The Prototyping ModelPrototyping Model also facilitates risk management; however, the risks need to be fully identified before the beginning of development work for the project. However, in the real world, troubles can arise after development work begins. In the event of that, we can't utilize to use the Prototyping Model efficiently. Through each stage in the Spiral Model, the functions in the software are evaluated and analyzed before the risks are identified and addressed by prototyping. This model is more flexible than others SDLC models.

Benefits of Spiral Model

Here are some benefits of the Spiral Model. Below are some advantages of the Spiral.

  • Risk Handling: The projects with many unknown risks that arise when the development progresses. In that situation, the Spiral Model is the most suitable development method because of the Risk analysis and risk management throughout the entire process.
  • Ideal for the large-scale project: Utilizing the Spiral Model for massive and complicated projects is recommended.
  • Flexibility in Requirements: Change requests made in the Requirements at a later time can be implemented precisely by applying this model.
  • Customer Satisfaction: Customers can see the evolution of the product at the beginning of the software development process and, consequently, they are familiar with the system using it before the launch of the entire product.

Spiral Model in SDLC, its Advantages and Disadvantages, Source: Youtube, SoftwaretestingbyMKT

Some limitations to the Spiral Model

The drawbacks of the model spiral include:

  • High cost: It is costly and does not work for smaller projects.
  • The dependence on the risk assessment: Since the project's successful conclusion relies on successful risk management, all individuals involved must be knowledgeable in risk analysis.
  • Complexity: The spiral design is much more complicated than other SDLC alternatives. To function effectively, protocols must be strictly followed. In addition, there is more excellent documentation as the model is comprised of intermediate steps.
  • It is challenging to control time. Time management is complex. Going to the task, critical phases are usually not known, which makes time management nearly impossible. Thus, there always is a chance of running behind or exceeding budget.

The Difference between Agile Spiral Model and Spiral Model

Agile Model

The primary goal of the Agile model is to create agility by eliminating unnecessary tasks which consume time and effort.

The agile approach does not depend on documentation.

The Agile model is based on the distribution in increments to customers at the end of each Time-box. This means that the interactions with customers are more frequent.

Difference between Spiral & Agile Model, Source: Youtube, Junkie Mountain

 

Spiral Model

The primary principle of the Spiral model is risk management.

Documentation is essential to use Spiral models. Spiral model.

The spiral model deals with different types of risks that are not anticipated, but the interactions with customers are lower.

Conclusion

I'm sure that by now, you will be able to comprehend the basics of the Spiral model, its advantages, cons, and cons, as well as the differences in both the Agile model and Spiral model. This model is great for larger projects in which you will be able to create and distribute smaller prototypes and further modify them to build the more prominent software. Implementation of this model needs skilled resources since risk analysis is an essential element. Risk analysis requires expertise, and as it is, this model can be expensive.

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Hope this article is helpful to you, thanks for reading.

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