Incremental
Model
Course: Analysis & Design of Software
System
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Incremental Development Model: Iterative Builds and Core Products, Lecture notes of System Analysis and Design
This document explains the Incremental Model, a software development approach where a system is designed and built in small, functional steps. It describes how the process combines the structured phases of the waterfall model with an iterative cycle, allowing developers to deliver a "core product" early on. You will learn how each subsequent version adds new features and refinements based on user feedback. The guide lists specific advantages, such as faster initial delivery and easier error detection, while also addressing challenges like the need for a strong initial architectural framework. It is a factual resource for students of software engineering focusing on project management strategies and flexible development lifecycles.
Typology: Lecture notes
2025/2026
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Incremental
Model
Course: Analysis & Design of Software System
Incremental Model
- (^) The software is developed in increments of functional capability; i.e., the development is in steps, with parts of some stages postponed in order to produce useful working functions earlier in the development of the project.
- (^) Other functions are slowly added later as increments.
- (^) Thus, while analysis and design are done following the waterfall process model, coding, integration and testing are done in an incremental manner.
What is Incremental
Model
- (^) When the elements of waterfall model are applied in iterative manner, the result is the Incremental Model.
- (^) In this, the product is
- (^) designed,
- (^) implemented,
- (^) integrated and
- (^) tested as incremental builds.
- (^) This model is more applicable where
- (^) software requirements are well defined
- (^) basic software functionality is required early.
Increments & Core
Product
When an increment model is used, the first
increment is a core product.
Iterative in nature
- (^) Focus is on
- (^) Delivery of a operational product with each increment
- (^) Early increments are “ slipped down ” versions of the final product.
- (^) They will provide the ability that serves the user
- (^) Provides a platform for evaluation by the user
Advantages of
Incremental Model
- (^) Users can give suggestions on the parts to be delivered at later points of time.
- (^) The developers engage themselves in developing the most fundamental functional features of the software in its first increment. Thus, these features get the maximum, and the most concentrated, attention from the developers. Therefore, there is great likelihood that the programs are error-free.
- (^) The time to show some results to the users is considerably reduced. User reactions, if any, can therefore be incorporated in the software with great ease.
- (^) Testing, error detection, and error correction become relatively easy tasks.