Water Fall Model:-

• Waterfall model is step by step implementation of SDLC.
• In waterfall model whenever 1^st stage gets completed than and then only procedure goes to next stage (phase).
• Generally waterfall model used in small scale company or small project.
• Generally time duration of waterfall model is 3 months.
• In this model we can not accept the change in requirement because it works in linear fashion.
• So if we change requirement then again we need to move from 1^st phase to last and then it will affect delivery deadlines and Planned Process.
• It is Plane Driven Model. Because of customer requirement are fixed.

How we are going to fix errors in waterfall model?

In waterfall model whenever tester found any defects than he do not send product (build) back to the developer, instead of that tester will log the defect and make the report and those defect are get fixed in next version (release) of product.