Ans: D 5 Changes made to an information system to add the desired but not necessarily the required features is called Software Engineering Mcqs A Preventative maintenance. B Adaptive maintenance. C Corrective maintenance. D Perfective maintenance.
B unambiguous. C consistent. D verifiable. B Constructive Cost Estimation Model. C Complete Cost Estimation Model. D Comprehensive Cost Estimation Model. B decreases. C remains constant. D cannot say anything. The spiral model has four phases: Planning, Design, Construct and Evaluation. A software project repeatedly passes through these phases in iterations called Spirals in this model.
Description: These phases are - Planning: This phase starts with the gathering of business requireme. The Prototyping Model is a Systems Development Methodology SDM within which a paradigm output or an early approximation of a final system or product is constructed, tested, and then reworked. It is done till an appropriate paradigm is achieved to help develop the entire system or product. This model works best in situations when all the details or requirements are not known well in advance.
Systems design is the process of defining elements of a system like modules, architecture, components and their interfaces and data for a system based on the specified requirements. It is the process of defining, developing and designing systems which satisfies the specific needs and requirements of a business or organization. Description: A systemic approach is required for a coherent and well. To prevent incorrect operation of a software or system, debugging is used to find and resolve bugs or defects.
When various subsystems or modules are tightly coupled, debugging becomes harder as any change in one module ma. The waterfall model is a classical model used in system development life cycle to create a system with a linear and sequential approach.
It is termed as waterfall because the model develops systematically from one phase to another in a downward fashion. This model is divided into different phases and the output of one phase is used as the input of the next phase.
Every phase has to be completed be. Nifty 18, Polycab India 2, Market Watch. Budget ET NOW. Suggest a new Definition Proposed definitions will be considered for inclusion in the Economictimes. Description: Software maintenance is a vast activity which includes optimization, error correction, deletion of discarded features and enhancement of existing features.
Spiral model is used in the following scenarios: When the project is large. Where the software needs continuous risk evaluation. Requirements are a bit complicated and require continuous clarification.
Software requires significant changes. Where enough time frame is their to get end user feedback. Where releases are required to be frequent. More and more features are added in a systematic way. Software is produced early. Has room for customer feedback and the changes are implemented faster. Disadvantages of using Spiral model: Disadvantages of Spiral model are as follows: Risk analysis is important phase so requires expert people.
Is not beneficial for smaller projects. Spiral may go infinitely. Documentation is more as it has intermediate phases. It is costly for smaller projects. Conclusion: Each spiral can be termed as a loop and each loop is a separate development process in a spiral model.
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