Incremental Model in Software Engineering

Here in this Tutorial we will discuss about the Incremental Model in software Engineering Tutorial. The tutorial is helpful for beginners and experience professionals.


In software engineering, there are various methods of achieving the development of a product, which is based on certain criteria that can be achieved. These are called SDLC (Software Development Lifecycles).

There are a few factors to consider when choosing a model for developing software, including the organization’s nature and the impact on testing methodologies. One such approach is incremental development.

What is an Incremental Model?

The incremental model, also called as the progressive iteration model, is a widely used software development process model in which software components are separated or broken down into various stand-alone plugins across the SDLC (Software Development Life Cycle). Each iteration is considered as a sub-project and follows the SDLC progressive paradigm throughout all stages. This appears to be an iterative model. However, because this model is an improvement on the iterative model, the continuous model is also known as the Iterative Enhancement Model. Instead of taking a giant leap, we accomplish our goals incrementally in the incremental model.

Use of Incremental Model

Use Incremental Models in the following scenarios:

  • Requirements are described, acknowledged, and known in advance. However, some criteria necessitate more time.
  • There is a responsibility to publish the product or get it to market as soon as possible.
  • The engineering team lacks the necessary skills or resources are lacking.
  • Product-based businesses create their own goods.
  • Cutting-edge technology is employed.
  • There are high-risk aims or attributes engaged.
  • Project development takes a long time.

Types of Incremental Model

There are currently two types of incremental models:

  • Staged Delivery Model: The incremental model is where only one task at a time is being accomplished. The staged-delivery model is when the outcome of the software project is delivered in successive stages, rather than all at once.
  • Parallel Development Model: The incremental model of development is different from the traditional pattern. This model involves multiple sub-systems being developed simultaneously, often with the same amount of resources.

Phases of Incremental Model

  1. Requirement analysis: The first phase of the incremental model is product analysis expertise to identify the requirements. And then, the software is developed based on what the requirement analysis team state.
  2. Design & Development: In this Phase completed designing a system, and therefore need to figure out how to program it. The Incremental model of SDLC uses both style and development phase.
  3. Testing: The incremental model simulates testing by checking to see the performance of each existing task in the system. As the program is running, it will make adjustments on the fly.
  4. Implementation: Implementation phase takes use of the final coding, designed in designing and development phase. After testing, the completed phase is capable of upgrading the system to its final form.

Advantages and Disadvantages of the Incremental Model

AdvantagesIncremental models:

  • A complete software mission and objectives are accomplished through incremental development.
  • The incremental model is an excellent alternative for managing with cost and flexibility. During development, the scope and requirements might be changed at any time.
  • This model’s verification and troubleshooting are simple and uncomplicated.
  • We can build working software quicker and more quickly with this methodology throughout product development. The successful completion can be shortened by separating the work.
  • This architecture allows the client to respond to each build and provide comment.
  • With incremental models, detecting errors is simple. Because hazardous items are detected and managed with that during iteration, risk management is simplified.
  • The most significant and relevant functional capabilities of a technology can be determined early in the development process.

Disadvantages of the Incremental Model

  • This model necessitates careful planning and design.
  • A thorough and explicit definition of the entire system is required in order to break it down and develop it sequentially.
  • The entire goal of increasing and decreasing will be destroyed if the requirement is not understood at the outset. As a result, if all specifications are not gathered up front during the full development lifecycle, proposed framework may have issues.
  • A fault in one unit must be fixed in all machines, which can take a long time.
  • The development phases are set in stone and do not overlap.


Q1. Where is the incremental model used?

Testing and debugging is easier when using incremental development because it involves making fewer changes during each iteration. It’s also more popular among web application developers as well as product companies who are developing a system that does not have many features.

Q2. Which model is called incremental model?

The Incremental Model is often referred to as the Iterative Model. It’s a method where you design, implement, and test in increments.

Q3. How many types of incremental models are there?

Incremental development provides a step by step approach that helps maintain control while completing anything from the top down, bottom up, middle out and use case options.

Q4. What are the features of incremental model?

Incremental modules have the following features.

  • System development is divided down into several small development projects
  • A total system has been developed by assembling component systems one by one.
  • The most important necessity is addressed first.
  • Once a need has been developed, it is frozen for such an incremental.

Q5. What are the phases of incremental model?

Incremental is a software development method through four different phases: requirements, design, coding, and testing.

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