The Incremental Process Model is a software development approach where the system is built and delivered in small, manageable parts called increments. Each increment adds new features until the complete system is developed.
- Develops the system in small, manageable increments.
- Allows changes and new features in later increments.
- Combines structured planning with iterative development.
Phases of Incremental Model
The Incremental Model is divided into multiple phases, where each increment goes through a complete development cycle to build the system step by step.
- Requirement Analysis: Requirements for the current increment are gathered and clearly defined.
- Design & Development: The system design is prepared, and new features are developed.
- Testing: Each increment is tested to ensure new and existing features work correctly.
- Implementation: The tested increment is delivered and integrated with previous versions.
These steps repeat until the final system is completed.
Types of Incremental Model
The Incremental Model has two main types, each offers different approaches to how software is developed in parts.
1. Staged Delivery Model
Develops software in a sequence of planned stages, where each stage delivers a functional part of the system. Each release brings the product closer to completion, allowing it to evolve gradually. Working versions are delivered at regular intervals, making progress visible and manageable throughout the development process.
2. Parallel Development Model
Divides the system into multiple modules that are developed in parallel by different teams. By working on separate components in parallel, the development process becomes faster and more efficient. This approach reduces overall project time and allows teams to focus on specific functionalities concurrently.
Advantages
- Early Software Delivery, improves customer satisfaction
- Easy to Manage Changes between increments
- Better Risk Management through early testing
- Cost Control by spreading budget over stages
- Simpler Debugging due to modular development
- High Software Quality through continuous testing
Note: The Incremental Model is not ideal when the software development team is not highly skilled or experienced because managing increments and integrating them well requires a competent team.
Disadvantages
- Requires Skilled Team and proper planning
- Cost May Increase due to repeated testing and integration
- Design Issues if future requirements are unclear
- Integration Challenges between increments
- Repeated Bug Fixing across multiple increments