Iterative and incremental development
After having witnessing crash of the waterfall model, the experts come up with another model called---Iterative and Incremental development. As the term suggests Iterative and Incremental development is an end-to-end software development technique, which kicks of with chalking out the concept and concludes with the enforcement of the planned measures in initial concept. The process is a cyclic, thus can be easily illustrated. Today, the iterative and incremental development is extensively used, as you can find it the Dynamic Systems Development Method, Extreme Programming, Rational Unified Process, and along with the agile software development frameworks.
Incremental development is all about planning and executing in small portions, which may be developed by different people at different times. All the small portions are later combined together to form the complete circle. However, the process is completely different other techniques and does not depend upon iterative development or waterfall development. If you want another option than incremental development, you'll have to come up with a "big bang" system.
According to experts, the Iterative development technique is a rework scheduling technique, under which the time is already fixed to enhance the compatibility of the system. Despite the technique does not presuppose the aforementioned methodology, but goes fantabulous with the former. However, the basic difference between the two techniques is that output from an increment may or may not be refined and the results of tests and feedbacks could not be used while inputting the data. On the other hand, iteration enables you to modify, revamp any structure and objectives of the consecutive iterations
The main fundamental behind the iterative technique is to configure a system on the basis of increment, which enables the expert or the person assigned on the project to gain benefit from his predecessor. The both the techniques allow the developers to learn and make the modifications and restructuring wherever they feel like. The method kicks off with general implementation of the small technical requirements and iteratively augments the further steps. The process goes on and on until the system witnesses all portions fully executed. In the latest versions, you can make modifications, additions during every stage of iteration.
Again, the entire process can be illustrated below:
Initialization step+ the Iteration step + the Project Control List = Process
At the beginning phase, a base version is created with an objective to garner feedback from the individual user. However, don’t forget it to keep it short, simple and crisp so that the learner can fully grasp the problem and reach a resolution to any of the issue put up. He should conveniently execute the strategy chalked out. Thus, a project control list is furnished with the technique, which allows one to keep track of all tasks that are supposed to be implemented. The list encompasses all kinds of tasks beginning with redesigning issues to the present designing issues. Don’t forget to update the list in order to meet the new era challenges.
Iterative development as the term suggests dissects the deliverable business value (system functionality) into different iterations. In each sublet, functionality is implemented utilising the cross-discipline work, which actually kicks of with the identification of the model to execution of the technique.
Iterations process can be understood in following steps/phases:
Inception: It encompasses the issues pertaining to project scope, risks, and requirements (functional and non-functional). However, allows you to extract to usable detail.
Elaboration: Detailed assessment of the project or the technique, enables one to reduce the subjectivity to any kind of risks. It also caters to the entire the non-functional things necessitated by the user or the project admin.
Construction: This is one of the delicate phase, where one needs to incrementally inscribe the architecture with production-ready code, which have been generated through the from analysis, design, implementation, and back-to-back tests of the things required for functioning.
Transition: The last phase basically facilitates the system with a production-operating environment.
Each of the aforementioned phases can be illustrated in single or muli-faceted iterations. These iterations are mainly time-bound instead focused on features. The role of the experts is clearly allocated and distributed that is Architects and analysts assess and chalk out one iteration while developers and testers confine themselves to the work-product backlogs.
Waterfall vs. Iterative Development
Debate is on over the superiority of both the techniques. However, Waterfall development generally concludes several projects and work products in a single step before marching ahead to the next phase. The main objective of the project that is garnering business value can only be received at the tend of end of the project.
Waterfall development completes the project-wide work-products of each discipline in a single step before moving on to the next discipline in the next step. Business value is delivered all at once, and only at the very end of the project.