Definition
A user story is a brief and concise description of a functionality or quality of a product or a service. It is informative and is written in spoken language.
How many times did we hear the client say: you implemented what was written, but this is not what I wanted? User stories focus on the value for the business. They invite the exploration of requirements by encouraging further discussions with stakeholders.
A user story is typically a sentence or two, each one containing 10 to 15 words, describing the need(s) of a user, their intended goal and any additional information required to understand the story.
A user story is not an untouchable list of needs. It is regularly modified, which makes it very common to use in agile methodology.

Why use User Stories?
Captures stakeholder needs and prioritize development of solutions
Provides a basis for estimating and planning solution delivery.
Allows generating user acceptance tests
Measures the delivery of value.
Traces and retraces requirements.
Creates a basis for additional analysis.
Assists project management and monitoring.
Although user stories are able to quickly provide value, this speed makes documentation less complete. Indeed, the objective of a user story is not to sustain management needs, to form a baseline for future works or to fulfil stakeholders’ expectations. Additional documentation can be required.
Strengths
How to create a User Story
INVEST criteria
Who is accountable for writing user stories?

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