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In page Waterfall model:

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A further argument supporting the waterfall model is that it places emphasis on documentation (such as requirements documents and design documents) as well as source code.[citation needed] In less thoroughly designed and documented methodologies, knowledge is lost if team members leave before the project is completed, and it may be difficult for a project to recover from the loss. If a fully working design document is present (as is the intent of big design up front and the waterfall model), new team members and new teams should be able to familiarise themselves to the project by reading the documents.[3]