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The INVEST model is a guideline used in Agile methodologies to ensure that user stories are well-formed and effective for development teams. The acronym stands for Independent, Negotiable, Valuable, Estimable, Small, and Testable.

When user stories are described as small and clear, they are easier for teams to understand, implement, and estimate in terms of effort and resources. A small user story is manageable, allowing a development team to complete it within a single iteration or sprint, which enhances productivity and focus. Clarity ensures that all team members have a shared understanding of what is being requested, leading to fewer misunderstandings and miscommunications during development.

In contrast, complicated and detailed stories may overwhelm the team, making it difficult to determine solutions. Large and extensive user stories can lead to scope creep and difficulties in managing workload and timelines. Broad and vague descriptions can result in ambiguity, leading to confusion and potential failures in meeting user expectations.