Podcast
Questions and Answers
What is a major limitation of the waterfall model?
What is a major limitation of the waterfall model?
When is the waterfall model most effective?
When is the waterfall model most effective?
What is the primary goal of a prototyping-based development process?
What is the primary goal of a prototyping-based development process?
What is an advantage of prototyping in systems development?
What is an advantage of prototyping in systems development?
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What is prototyping effective for?
What is prototyping effective for?
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What is another benefit of prototyping in systems development?
What is another benefit of prototyping in systems development?
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What is the primary purpose of prototyping in software development?
What is the primary purpose of prototyping in software development?
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What type of systems is the prototyping process model suitable for?
What type of systems is the prototyping process model suitable for?
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What is a characteristic of the iterative-enhancement model?
What is a characteristic of the iterative-enhancement model?
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What is the benefit of using prototyping in software development?
What is the benefit of using prototyping in software development?
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What is the primary difference between the prototyping process model and the iterative-enhancement model?
What is the primary difference between the prototyping process model and the iterative-enhancement model?
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What is the outcome of using the prototyping process model in software development?
What is the outcome of using the prototyping process model in software development?
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What is the primary advantage of the waterfall model?
What is the primary advantage of the waterfall model?
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What percentage of maintenance costs are attributed to perfective maintenance?
What percentage of maintenance costs are attributed to perfective maintenance?
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What is the primary difference between beta testing and acceptance testing?
What is the primary difference between beta testing and acceptance testing?
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What is a disadvantage of the waterfall model?
What is a disadvantage of the waterfall model?
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What is the term that might be more suitable than 'maintenance'?
What is the term that might be more suitable than 'maintenance'?
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What is a characteristic of the waterfall model?
What is a characteristic of the waterfall model?
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Study Notes
Waterfall Model
- Despite limitations, the waterfall model is still used when the developing organization is familiar with the problem domain and software requirements are clear.
- The waterfall model is efficient in such cases.
- The model assumes that requirements can be frozen before design begins.
- It is not suitable for complicated and large systems with no manual process to determine requirements.
Prototyping Process Model
- Goal is to counter the limitation of the waterfall model by building a throwaway prototype to understand requirements.
- Suitable for complicated and large systems with no manual process to determine requirements.
- Helps determine system requirements by letting clients "play" with the prototype.
- Effective method for demonstrating feasibility of a certain approach, especially for novel systems.
Testing
- Beta testing is performed by a group of friendly customers in the presence of the software-development team.
- Acceptance testing is performed by customers themselves.
- Software is installed at the customer's site if successful in acceptance testing.
Delivery and Maintenance
- Delivery of software is often done in two stages.
- Cost of maintenance is often more than 60% of the total cost of software.
- Over 50% of maintenance costs are attributed to perfective maintenance.
- Evolution is a better term than maintenance.
Advantages of Waterfall Model
- Simplicity and straightforwardness divide the task of building a software system into cleanly divided phases.
- Easy to administer in a contractual setup.
- Each phase completion is accompanied by payment from the customer to the developing organization.
Disadvantages of Waterfall Model
- Assumes that requirements can be frozen before design begins, requiring hardware choice.
- Encourages "requirements bloating".
- Follows the "big bang" approach, delivering the entire software in one shot.
- Is a document-driven process requiring formal documents at each phase.
Prototyping Process
- Users are given an opportunity to use and explore the prototype, providing feedback to developers.
- Feedback is used to modify the prototype until the required prototype is reached.
Advantages of Prototyping Process Model
- Suitable for large systems with no manual process to define requirements.
- User training is facilitated.
- Quality of software is good.
- Requirements are not frozen.
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Description
Understanding waterfall and prototyping process models in software development, including their limitations and advantages