Waterfall vs Incremental vs Spiral vs Rad Model

Waterfall vs Incremental vs Spiral vs Rad Model: To deal with the level of intricacy during the software development cycle, different SDLC model is carried out by the software companies. Their point is to convey a quality software product, anyway each model is exceptional as far as their software development approach. To effectively learn with the SDLC models we will look at the different models of Software Engineering. Here we will perceive how each model varies from other as far as cost, time duration, necessities, maintenance etc.

What is The Waterfall Model?

WATERFALL MODEL is a sequential model that divides software development into pre-defined phases. Each phase should be finished before the next phase can start with no cover between the phases. Each phase is designed for performing specific activity during the SDLC phase. It was presented in 1970 by Winston Royce.

What is Incremental Model?

Incremental Model is a process of software development where necessities divided into numerous standalone modules of the software development cycle. In this model, each module goes through the prerequisites, design, implementation and testing stages. Each resulting arrival of the module adds function to the previous release. The process proceeds until the total system achieved.

What is Spiral Model?

The spiral model is a combination of sequential and prototype models. This model is best used for large projects which include persistent improvements. There are explicit activities that are done in one iteration (spiral) where the output is a small prototype of the large software. Similar activities are then repeated for every one of the spirals until the whole software is built.

What is RAD Model?

RAD model is Rapid Application Development model. It’s a type of incremental model. In Rapid Application Development model the components or functions are developed in parallel as though they were mini projects. The developments are time boxed, delivered and afterward gathered into a working prototype.

This can rapidly give the client something to see and use and to give feedback regarding the delivery and their prerequisites.

Comparison of Various SDLC Models

Properties of ModelWater-Fall ModelIncremental ModelSpiral ModelRad Model
Planning in early stageYesYesYesNo
Returning to an earlier phaseNoYesYesYes
Handle Large-ProjectNot AppropriateNot AppropriateAppropriateNot Appropriate
Detailed DocumentationNecessaryYes but not muchYesLimited
Requirement SpecificationsBeginningBeginningBeginningTime boxed release
Flexibility to changeDifficultEasyEasyEasy
User InvolvementOnly at beginningIntermediateHighOnly at the beginning
MaintenanceLeastPromotes MaintainabilityTypicalEasily Maintained
DurationLongVery longLongShort
Risk InvolvementHighLowMedium to high riskLow
Framework TypeLinearLinear + IterativeLinear + IterativeLinear
TestingAfter completion of coding phaseAfter every iterationAt the end of the engineering phaseAfter completion of coding
Overlapping PhasesNoYes (As parallel development is there)NoYes
MaintenanceLeast MaintainableMaintainableYesEasily Maintainable
Re-usabilityLeast possibleTo some extentTo some extentYes
Time-FrameVery LongLongLongShort
Working software availabilityAt the end of the life-cycleAt the end of every iterationAt the end of every iterationAt the end of the life cycle
ObjectiveHigh AssuranceRapid DevelopmentHigh AssuranceRapid development
Team sizeLarge TeamNot Large TeamLarge TeamSmall Team
Customer control over administratorVery LowYesYesYes


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SDLC: Phases & Models of Software Development Life Cycle

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