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  Incremental Model

Introduction to Incremental Model

Incremental model was given by mills whose approach was based on the evolutionary prototypes which combined the linear sequential steps strategy. With the repetitive based   technique of the prototypes model. The basic idea under its development is that the software should be developed in increments. Each increment adding some functional capability to the software until the full software is implemented.

The experience gained with  each  increment is used  to define the requirements  for the  next increment  extends software capability a little bit  further and  process continues  until no further  improvement  appears possible or worth wile. The incremental model is shown in fig 2.11

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In the fig2.11 the linear sequences of waterfall model are stepped as the calendar time progresses. This model  reduces the rework  in the development  process  and given  some  opportunity  to the customers to delay the decisions  until they  had  some  experience with  the software.

Initially, the communication takes place   between the developer and customer. At this first stage customer can give his most important and well known requirements. But the least ones are not discussed at this stage. The developer starts to build the model by applying the various phases' analysis design, coding and testing. This process of first increment will quickly release some type of product. This first increment is called as core product. once  one in increment completed and delivered, customer can  put it  in to  the  operational  environment, they  can test it practically to help to clarify their requirements  for later increments  and the later versions of the  current  increment .

As new requirements    are completed. The second increment takes place. The release of second increment comes out, which has additional capabilities than first increment.

This process will continue in the iteration mode until the nth iteration completers. At this stage. The whole software is developed.

Advantages

Less Human Resources

There is a less requirement of human at the beginning because at the initial stage. There are small increments and the products can be produced with less man power.

As the number of increment increases.  More members can be added to it.

Manage Technologies

There is also less risk of technical   resources. For  an example , if  a new  hardware  is needed to build  the project ,but    that has not been procured fully then  in  the initial  increments the  use and need of that hardware is avoided. And at the later stages. When it is built can be included in the project.

Customer Evaluation and Satisfaction

As   the new increments come out one by one they are evaluated and checked by   the customer regularly. The customers must be satisfied to see the progress of the   software and to see that their given requirements are going to be met with the coming increment. So they do not have to wait mush for the whole software delivery.

Customer Experience

As customer checks all the increment he gains experience and knowledge which inform him the new requirements for the later increments.

Project Failure Risk

This risk will be low. Because it is expected that some project will obviously be released to the customer

Disadvantages

Increment size

The increment should be neither too small or nor too large. The very  small increments  will have  small  functions  and the project will become  more time consuming  whereas too  large increments may  have complex  strategies, functionalities which  might  not be  understood by  the customer.

Requirements Categorization

It is difficult to categorize the requirements as most important and least important for the customer. Sometimes incorrect categorization may lead to the technical problems.

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