INVEST criteria in Agile

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00:05 About INVEST
01:01 Independent
02:01 Negotiable
04:29 Valuable
06:12 Estimable
07:26 Small
08:06 Testable
10:01 Summary

The INVEST criteria for agile software projects was created by Bill Wake as a reminder of the characteristics of a good quality Product Backlog Item (commonly written in user story format, but not required to be). Such Product Backlog Item may be used in a Scrum or Kanban backlog or XP project.

Ideally, stories are independent from one another. This isn't always possible, but to the extent, it is, stories should be written so that they can be developed in any order.
The details of a story are negotiated between the user and the developers.
Stories should be written so that their value to users or the customer is clear. The best way to achieve this is to have the customer write the stories.
Stories may be annotated with details, but too much detail obscures the meaning of the story and can give the impression that no conversation is necessary between the developers and the customer.
One of the best ways to annotate a story is to write test cases for the story. If they are too big, compound and complex stories may be split into multiple smaller stories. If they are too small, multiple tiny stories may be combined into one bigger story.
Stories need to be testable.

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