Incremental Process Model In Software Engineering From A-Z

Incremental Process Model In Software Engineering From A-Z

Thanks to the emergence as well as the powerful functions of numerous software development models, the software engineering life cycle is becoming easier and faster. In the list of these models, the incremental is known as one of the most effective and applicable. Learn about incremental process model in software engineering from A-Z in the article below!

What is incremental process model in software engineering?

The incremental model of software development is also known as the Successive version model.  It is a process of developing software where the requirements are split up into various independent software development cycle modules. Each module in incremental life cycle model undergoes the phases of requirements, design, implementation, and testing. The module’s functionality is increased with each new release. The procedure keeps going till the entire system is achieved.

Types of incremental model

There are two types of incremental model in SDLC.

Staged Deliverystaged delivery

The staged-delivery model is a lifecycle model which shows software to the customer in successively refined stages. When using staged delivery, you are fully aware of the final product before beginning construction. The staged-delivery strategy stands out since the software is not delivered all at once at the project’s conclusion. Throughout the project, you offer it in progressively more detailed phases. (This model is also known as “incremental implementation.”)

Parallel Developmentparallel development

This is a different kind of incremental process model that comprises multiple concurrently created subsystems. The TTM (Time to Market) or calendar time needed for the development can be reduced if sufficient resources are available.

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4 phases of incremental process modelphases incremental model

The phases listed below are used to explain incremental process model in software engineering.

Requirement analysis

The incremental development model in software engineering begins with the requirement phase. Understanding the initial requirements is essential for product development because it is hard to create a solution that adds value for customers without it. At this phase, prospective clients are surveyed for both functional and non-functional requirements by business analysts and project managers. The team should compile all of the project’s needs into one document after completing the requirement analysis process.

Design & Development

In this stage, the product architect uses the SRS document to create an optimized product architecture. Based on the specifications provided by SRS, the product architect develops a preliminary design, and working models, describes how the software functions, how the new design looks, how the control flows from one screen to another, etc. The product architecture will be saved in a DDS (Design Document Specification) after they are finished building it.

The DDS document can be put into practice after being authorized by all parties. After describing each module’s functionality (capability) and how it interacts with other modules or across systems, the overall system architecture is created. Following the coding standards specified by the organization, developers then start developing. As soon as the new code is finished, developers utilize the programming tools to compile and debug it to make sure it functions properly.


Once the code has been written, it is tested in this phase (the third phase of incremental process) to see if it functions as intended. The developer conducts preliminary testing, such as unit testing and/or application integration testing, before delivering code to the testing team. If everything goes as planned, the code is transferred to the testing environment. The testing will then be carried out by the testing team. Testing is carried out to see if the programming and code adhere to customer/business requirements. Companies can find all problems and errors in their software during the testing process and fix them before the implementation phase starts.


The incremental life cycle model ends with the final phase – implementation. Once a product has been tested and has successfully completed each testing stage, it is ready for go-live. Therefore, the product is prepared for end customers to use in a real-world setting. The client analyzes the test findings and accepts the deployment of the program after it has undergone thorough testing and is free of mistakes and flaws. The system’s current end users can use the new capability after the product is deployed.

Incremental process model advantages and disadvantages

Like other software development models, the incremental development process model also has certain advantages and disadvantages.


  • During the software life cycle, the software will be produced swiftly.
  • Requirements and scope changes are flexible and inexpensive.
  • Changes could be made at any stage of development.
  • This model is less expensive than others.
  • Each building is open to customer feedback.
  • Errors are simple to notice.


  • Planning and designing must be done well.
  • Since not all requirements are gathered up front for the full program lifetime, problems may arise.
  • It takes a lot of time and effort to fix an issue in one unit because each iteration step is stiff and does not cross over with the others.

incremental process model in software engineering


The above are all necessary basics about the incremental process model in software engineering. The incremental model is an effective method to identify risk, program complexity, funding schedule, or the necessity for early benefit realization. It is also suitable for projects which have known up-front requirements; projects with new technology; projects that have lengthy development schedules and projects that require good planning, design, or well-defined module interfaces.

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