Incremental build model
Encyclopedia
The incremental build model is a method of software development
where the model is designed
, implemented and tested
incrementally (a little more is added each time) until the product is finished. It involves both development and maintenance. The product is defined as finished when it satisfies all of its requirements. This model combines the elements of the waterfall model
with the iterative philosophy of prototyping.
The product is decomposed into a number of components, each of which are designed and built separately (termed as builds).
Each component is delivered to the client when it is complete. This allows partial utilisation of product and avoids a long
development time. It also creates a large initial capital outlay with the subsequent long wait avoided. This model of development also helps ease the traumatic effect of introducing completely new system all at once. There are, overall, few problems with this model.
, where the waterfall model
is incrementally applied. Roger S. Pressman-Software Engineering
The series of releases is referred to as “increments”, with each increment providing more functionality to the customers. After the first increment, a core product is delivered, which can already be used by the customer. Based on customer feedback, a plan is developed for the next increments, and modifications are made accordingly. This process continues, with increments being delivered until the complete product is delivered. The incremental philosophy is also used in the agile process model(see Agile Modeling
). Roger S. Pressman-Software Engineering
Advantages
Disadvantages
A component based construction approach is used. A RAD process development team can create a “fully functional system” within a very short time period Roger S. Pressman-Software Engineering provided that the requirements are clearly communicated. The generic framework activities are presented earlier.
Software development
Software development is the development of a software product...
where the model is designed
Software design
Software design is a process of problem solving and planning for a software solution. After the purpose and specifications of software are determined, software developers will design or employ designers to develop a plan for a solution...
, implemented and tested
Software testing
Software testing is an investigation conducted to provide stakeholders with information about the quality of the product or service under test. Software testing can also provide an objective, independent view of the software to allow the business to appreciate and understand the risks of software...
incrementally (a little more is added each time) until the product is finished. It involves both development and maintenance. The product is defined as finished when it satisfies all of its requirements. This model combines the elements of the waterfall model
Waterfall model
The waterfall model is a sequential design process, often used in software development processes, in which progress is seen as flowing steadily downwards through the phases of Conception, Initiation, Analysis, Design, Construction, Testing, Production/Implementation and Maintenance.The waterfall...
with the iterative philosophy of prototyping.
The product is decomposed into a number of components, each of which are designed and built separately (termed as builds).
Each component is delivered to the client when it is complete. This allows partial utilisation of product and avoids a long
development time. It also creates a large initial capital outlay with the subsequent long wait avoided. This model of development also helps ease the traumatic effect of introducing completely new system all at once. There are, overall, few problems with this model.
Incremental Process Models
The initial software requirements may be well-defined but it provides a limited scope of development, in such cases expansion is required and a process model is designed .Incremental Model
The incremental Model is an evolution of the waterfall modelWaterfall model
The waterfall model is a sequential design process, often used in software development processes, in which progress is seen as flowing steadily downwards through the phases of Conception, Initiation, Analysis, Design, Construction, Testing, Production/Implementation and Maintenance.The waterfall...
, where the waterfall model
Waterfall model
The waterfall model is a sequential design process, often used in software development processes, in which progress is seen as flowing steadily downwards through the phases of Conception, Initiation, Analysis, Design, Construction, Testing, Production/Implementation and Maintenance.The waterfall...
is incrementally applied. Roger S. Pressman-Software Engineering
The series of releases is referred to as “increments”, with each increment providing more functionality to the customers. After the first increment, a core product is delivered, which can already be used by the customer. Based on customer feedback, a plan is developed for the next increments, and modifications are made accordingly. This process continues, with increments being delivered until the complete product is delivered. The incremental philosophy is also used in the agile process model(see Agile Modeling
Agile Modeling
Agile Modeling is a practice-based methodology for modeling and documentation of software-based systems. It is intended to be a collection of values, principles, and practices for Modeling software that can be applied on a software development project in a more flexible manner than traditional...
). Roger S. Pressman-Software Engineering
Advantages
- After every iteration any faulty piece software can be identified easily as very few changes are done after every iteration.
- It is easier to test and debug as testing and debugging can be performed after each iteration.
- This model does not affect anyone's business values because they provide core of the software which customer needs,which will indeed help that person to keep run his business.
- After establishing an overall architecture,system is developed and delivered in increments.
Disadvantages
- If the requirements intially were thought to be stable but at later stages are realized to be unstable then the increments have to be withdrawn and have to be reworked.
- Resulting cost may exceed the cost of the organization.
- Problems may arise related to system architecture.
RAD model
Rapid Application Development (RAD) is an incremental software process model that emphasizes a short development.A component based construction approach is used. A RAD process development team can create a “fully functional system” within a very short time period Roger S. Pressman-Software Engineering provided that the requirements are clearly communicated. The generic framework activities are presented earlier.
Tasks involved:
These tasks are common to all the models R.S Pressman-Software Engineering- Communication: helps to understand the objective.
- Planning: required as many people (software teams) work on the same project but different function at same time.
- Modelling: involves-business modeling,data modeling,process modeling and process modeling.
- Construction: this involves the reuse software components and automatic code
- Deployment: integration of all the increments
External Links
- http.myprojects.kostigoff.net/methodology/development_models/development_models.htm
- www.softdevteam.com/Incremental-lifecycle.asp