Spiral Model

 

In our software development paradigm were going to discuss another model that is known as the spiral model. So now let us discuss this spiral model what is this final model. we shall discuss the strengths and weaknesses and where to use or going to use this spiral model.In spiral model we're having risk management, prototypes, design, code, integration, test and implementation. So we are considering under product development and now one release will be obtained to the client so that client can use it we're having the next phase planning and then we are going for the review then proved objective identification then cumulative cost again the progress will be initiated and then alternate evaluation

will be done and then again we are going for this product development phases. 

 

 

 

So in this way the spiral model will work and you can particularly look at this particular figure and you can find that this risk management is taken care of in case of spiral model. So that is the uniqueness in spiral model. Spiral model is the combination of both iterative model and one of the SDLC model. This iterative model means it will go on doing in iteration.

 

Iteration means looping so it can be seen as if you choose one SDLC model  and combine it with cyclic process that is an iterative model. In this case you are selecting one of the SDLC models and the iterative model. So these two models are getting combined to give you the shape of this spiral model. Now we are mentioning that very vital point that this model considered risk and which offend goes nu-noticed by most of the other models. This model starts with determining the objectives and the constraints of the software. At the start of the of the iteration and next phase is to prototyping the software and this includes risk analysis. So then one standard SDLC model is used to build the software. In the fourth phase of the plan of the next iteration is prepared.

we're having one two three four different phases. Software or the product development phase which is having one of the SDLC. A lifecycle model can be implemented here for design, coding, integration, testing and implementation then release will be obtained and this process is iterative because it will go on looping. Iteration means looping and here you are having that next planning and then the objective will be identified and the cumulative cost and the progress will be obtained and again that process will be repeated. so now let us go for the strengths drawbacks.  When to use this spiral model we are discussing spiral model strength. So what is developed at first if it is a question then obviously our

answer should be that critical heidi's functions are to be developed at first. 

 

why because if we can if you can develop the high risk components at first. What will happen as we're implementing the high risk components are the functions at first then what will happen

if there is some failure in that development then that will be a less costly affair as for us. So this model

provides early indication of existence of risks without much cost. How does the user benefit so answer is users can be closely tied to all the life cycle steps. Users see the system early because of rapid prototyping tools and early and frequent feedback from the users will enrich this development process to get lead to the actual development according to the requirements and expectation of the customers.

 

Disadvantages

Now we are discussing spiral model weaknesses what is the impact of using spiral model for small or low-risk projects time spent for evaluating risks too large for small or low-risk projects. So time spent planning, resetting objectives, doing risk analysis and prototyping may be excessive. These are the disadvantages and drawbacks of this spiral model. Judging the risk analysis doing the risk analysis and finding the most risky model which is to be implemented at first and also doing the prototyping will be the excessive.This model is complex and expertise are required. Risk assessment expertise is highly required in the proper implementation of the spiral model so in this discussion we have discussed lots of issues on the spiral model.