SPIRAL MODEL IN SOFTWARE PROCESS;
spiral model in software engineering and its role to develop software.
SPIRAL MODEL:
The spiral model of the software process (Figure 4.5) was originally proposed
Boehm (Boehm, 1988) instead represents the software process as a continuum
One activity is the activity, with some backtracking in the other activity
Represented as a spiral. Each loop in the spiral represents one phase of the software
The process can, thus, be related to the feasibility of the most internal loop system
Next loop with definitions of requirements, next loop with system design and so on.
in this spiral model every having four parts:
1. Objective setting
Specific purpose objectives are defined for this phase of the project.
Barriers to this process and product are identified and a detailed management plan is developed. The risks of the project have been identified. Alternative strategies,
Depending on these risks, can plan.
2. Risk assessment and reduction:
For each of the risk assessment and mitigation plans,
A detailed analysis is done. Measures are taken to reduce the risk. For example, if there is a risk that the requirements are inappropriate, a prototype system can be developed.
This is a diagram as an example of this article to develop the software in software engineering that can easily understand the spiral of SDLC in the software process a, in information technology click the link.
3.Development and validation:
Development and validation After the risk assessment, a development model for
The system is selected. For example, if user interface risks prevail, an appropriate developmental model might be evolutionary prototyping. If there are safety risks
The basic idea can be developed based on formal changes
Most appropriate and so on. The waterfall model may be the most appropriate development model if the underlying identified risk is subsystem integration.
4.Planning.
Planning The project is reviewed and decides whether to continue
Another loop of the spiral If it is decided to continue, plans are drawn
The next step in the project
The main difference between spiral models and other software process models
The spiral model clearly identifies the risk. Informally, the risk is straightforward.
A cycle of spirals begins with a description of the performance and the like
Alternative ways of achieving these goals and obstacles
Then each of them is imposed. Each alternative is evaluated against
Every objective and source of project risk is identified. The next step is to solve it
Information gathering activities such as more detailed risk analysis, prototyping, and simulation. Once the risks are assessed, some progress is made, followed by the planning activity for the next stage of the process.
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