Spiral software development life cycle model - Project management (PMP)

Describe spiral software development life cycle model.

- The spiral model combines the idea of iterative development with the systematic, controlled aspects of the waterfall model.

- Spiral model is a combination of iterative development process model and sequential linear development model i.e. waterfall model with very high emphasis on risk analysis.

- It allows for incremental releases of the product, or incremental refinement through each iteration around the spiral.

Spiral Model design

- The spiral model has four phases.
- A software project repeatedly passes through these phases in iterations called Spirals.

1. Identification:

- In this phase gathering the business requirements in the baseline spiral.
- As the product matures in the subsequent spirals the identification of system requirements, subsystem requirements and unit requirements takes place in this phase.
- It also includes understanding the system requirements by continuous communication between the customer and the system analyst.
- Towards the end of spiral the product is deployed in the identified market.

2. Design:

- This phase starts with the concept design in the baseline spiral.
- It involves architectural design, logical design of modules, physical product design and final design in the subsequent spirals.

3. Construct or Build:

- This phase refers to production of the actual software product at every spiral.
- When the product is just thought of and the design is being developed a POC (Proof of Concept) it is developed in this phase to get customer feedback.
- Then in the subsequent spirals with higher clarity on requirements and design details a working model of the software called build is produced with a version number. These builds are sent to customer for feedback.

4. Evaluation and Risk Analysis:

- Risk Analysis includes various activities such as identifying, estimating, and monitoring technical feasibility and management risks, such as schedule slippage and cost overrun.
- After testing the product, at the end of first iteration, the customer will evaluate the software and provide the feedback.
Phases in the spiral model - Project management (PMP)
Phases in spiral model: a) System requirements are identified in detail. b) An initial design is created for the new system based on the requirements in previous phase......
Strengths of the spiral model- Project management (PMP)
Strengths of the Spiral model: a) Early identification of potential risk areas. b) Customer sees a prototype very early in the SDLC....
Weaknesses of the spiral model - Project management (PMP)
Weaknesses of Spiral model are: a) Not suitable for smaller or low budget projects as cost is high for identifying risks....
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