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1	1	# User Stories
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3		-In Agile, **the project workload is broken down into user stories** and estimated, prioritized, and assigned. A user story, or often just called a 'story', is an abbreviated description of a feature of a system, told from the user's perspective. There are two forms:
	3	+In Agile, **the project workload is broken down into user stories** and estimated, prioritized, and assigned. A user story, or often just called a 'story', is an abbreviated description of a feature of a system, told from the user's perspective. There are two forms:
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5	5	* Long form = A sentence that describes exactly how the user interacts with the system. "When I go to the login page, enter my credentials and click the login button, the home page appears."
6	6	* Short form = A minimal set of words that hint at the underlying interactions, such as "Login".
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	8	+**Story-Driven Development**: In projects, there may be many interdependent stories to implement, so the final design will be very complex and impossible to predict in advance. Therefore, the initial [[waterfall|doc:Software Engineering.Agile.Problems of Waterfall.WebHome]] planning is likely to fail. The solution is to implement the stories sequentially, even if it means redesigning the previous design frequently. This breaks the one big complex problem into many small but manageable chunks.
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8	8	# Iterations
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10	10	Opposed to dividing the project schedule into distinct phases like in [[waterfall|doc:Software Engineering.Agile.Problems of Waterfall.WebHome]] workflow, in Agile **the project schedule is broken down into iterations with a fixed size** of usually two weeks. For example, a 1-year project could have 26 iterations of 2 weeks each. An iteration is not a mini-waterfall with specific phases that occur only once and in a particular order, such as planning -> design -> implementation -> testing. In an iteration, all phases are performed continuously, allowing for overlap and frequent revisits. For example, if a design problem arises during implementation, you simply redesign immediately and then continue implementing.
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36	36	* For subsequent iterations, the team expects the velocity of the current iteration to be the same as the velocity of the previous iteration, as this is the best guess.
37	37	* Stakeholders select cards from the top of the story deck so that the sum of the points of all the selected cards matches the expected velocity. The stories on these selected cards will be implemented in the iteration. Remember that some stories may depend on other stories that need to be implemented first.
38	38	* **Story Deck Evolution**
39		- * Solved stories are removed from the Story Deck. As the project progresses, new usage requirements may emerge and be added as new cards to the Story Deck. Stories could also split or merge.
40		- * Estimated effort and business value are affected by the evolution of the project. Therefore, stories need to be re-evaluated and the story deck re-ordered on a regular basis, i.e. in the IPMs.
41		- * There may be stories that do not currently have a favorable ROI and are not worth implementing. They remain in the story deck because there is a chance that their estimated effort and business value will change over time, making them worth implementing later. Conversely, some stories may become irrelevant over time.
42		- * If the story deck has no stories with a ROI that makes them worth implementing, the project ends.
	41	+ * **Stories Evolve**: Solved stories are removed from the Story Deck. As the project progresses, new usage requirements may emerge and be added as new cards to the Story Deck. Stories could also split or merge.
	42	+ * **Estimates Evolve**: Estimated effort and business value are affected by the evolution of the project. Therefore, stories need to be re-evaluated and the story deck re-ordered on a regular basis, i.e. in the IPMs.
	43	+ * **Keep All Stories in the Deck**: There may be stories that do not currently have a favorable ROI and are not worth implementing. They remain in the story deck because there is a chance that their estimated effort and business value will change over time, making them worth implementing later. Conversely, some stories may become irrelevant over time as their estimated ROI decreases.
	44	+ * **Project End**: If the story deck has no stories with a ROI that makes them worth implementing, the project ends.
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44	44	### During Iteration
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