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Table of contents
Incremental Model
Phases of Incremental Model
Types of Incremental Models
Advantages of Incremental Model
Disadvantages of Incremental Model
When to use Incremental Model
Key Takeaways
Last Updated: Mar 27, 2024

Incremental Model

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Prerita Agarwal
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The numerous procedures or approaches that are picked for the project's development based on the project's aims and goals are referred to as software development models. A variety of development life cycle models have been created to meet various requirements. The models define the multiple steps of the process and the sequence in which they must be completed.

The chosen model has a significant influence on the testing carried out. It will decide the what, where, and when of our planned testing and affect regression testing and determine which test approaches to employ.

Let us help you understand one of these software development models, Incremental Model, how it is implemented along with its various phases and its advantages and disadvantages.

Incremental Model

The incremental model is a software development approach that divides requirements into numerous separate modules during the software development cycle. Each module in this paradigm goes through requirements, design, implementation, and testing processes. Every release of the module after then adds functionality to the preceding version. The procedure is repeated until the entire system is completed.

Successive version model is another name for the incremental model.

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Phases of Incremental Model

Let's look at the various phases in the incremental model.

  1. Requirement analysis: The product analysis expertise identifies the requirements in the first phase of the incremental model. The requirement analysis team also understands the system's functional needs. This phase is critical for developing software using the incremental methodology.
  2. Design & Development: The design of the system functionality and the development technique is completed successfully in this phase of the Incremental model of SDLC. The incremental model employs the style and development phase when software creates new functionality.
  3. Implementation: The coding phase of the development system is enabled by the implementation phase. It entails the final code created throughout the design, development, and testing process. Following the conclusion of this phase, the number of working products is increased and updated to the final system product.
  4. Testing: The testing step of the incremental approach examines the performance of each current function and new capabilities. Various techniques are utilized to test the behavior of each task throughout the testing phase.

Phases of Incremental Model


Also read,  V Model in Software Engineering and Introduction to Software Engineering.

Types of Incremental Models

The different types of incremental model are as follows:-

1. Staged Delivery Model: Only one portion of the project is created at a time with this sort of incremental methodology. As demonstrated below, we don't deliver the software all at once under the staged-delivery approach instead in phases during the project.


Phases of Staged Delivery Model



2. Parallel Development Model: As demonstrated below, this incremental methodology entails the creation of several sub-systems at the same time. It is possible to reduce the time required for the development process, i.e., TTM(Time to Market), if appropriate resources are available.


Phases of Parallel Development


Advantages of Incremental Model

The advantages of the incremental model are as follows:-

  • Changing criteria and scope is more flexible and less expensive.
  • Errors are easily identifiable.
  • Risk is easy to manage because it is taken care of at each iteration.
  • Each structure can elicit a response from a consumer.

Disadvantages of Incremental Model

The disadvantages of the incremental model are as follows:-

  • Correction of a fault in one unit necessitates revision in other units and takes a long time.
  • Module interfaces must be well defined.
  • It necessitates careful planning and design.
  • Its entire cost is relatively high.


Also check out - Phases of Compiler

When to use Incremental Model

The incremental model is used in the following scenarios:-

  • The system's requirements are well understood.
  • When there is a demand for an early release of a product.
  • When high-risk characteristics and objectives are involved.
  • Web application and product-based businesses are more likely to employ this model.
  • When a project's development timetable is protracted.


1. What is the most important use of the Incremental Model?
Ans. Because comparatively modest changes are done during each iteration, the incremental approach is often easier to test and debug than other software development techniques. It is popular, especially when we need to swiftly produce a restricted capability system.


2. What is the difference between the Iterative and Incremental models?
Ans. The critical distinction between an iterative and an incremental life cycle is that an iterative process advances by continual refining, whereas an incremental process advances in tiny steps.


3. How many versions of the software are made before the final release?
Ans. Until the entire fulfillment of user requirements (it may be just the core functionality for early release), the incremental iteration process continues. The final release contains all the features asked by the user.


4. How is the incremental model different from Waterfall Model?
Ans. The fundamental difference is that the functioning version of a waterfall model is supplied in the deployment phase, the last phase of the waterfall model. In contrast, the working version of an incremental model integrating fundamental requirements is delivered in the first increment, with extra features later.


5. Can a large project size incorporate the incremental model?
Ans. The effectiveness of an incremental model is contingent on a thorough understanding of the scope and needs. The project may be split into smaller, deliverable portions and delivered in phases throughout the project once specified and documented. Breaking down a significant project into smaller chunks might lower the initial product delivery cost, but it can also raise the overall project cost.

Key Takeaways

This article extensively discussed the Incremental Model used in the software development life cycle and its advantages and disadvantages. 

We hope that this blog has helped you enhance your knowledge of the Incremental Model and other software development processes. For learning more about software project management or other models like Iterative ModelAgile Model, and more by looking at our other connected articles on Code Studio Do upvote our blog to help other ninjas grow. Happy Coding!

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