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Scrum Glossary – INVEST

How do we know if a Product Backlog Item is of a good quality? We need to make sure it’s not too large to be implemented in a Sprint and that it can be tested in order to say that it’s Done.

To help us ensure a PBI is of good quality, we can use INVEST:

Independant – the PBI should be self-contained and not depend on other PBIs.

Negotiable – the PBI is not an explicit contract and should be open for discussion.

Valuable – it must deliver some form of value to the business

Estimable – the development team must be able to estimate how much effort it will take to implement the PBI.

Small – the PBI must fit within a Sprint.

Testable – we must be able to define tests/acceptance criteria for the PBI so that we know when it is Done.

Scrum Glossary – acceptance criteria

Acceptance criteria are used to define when a task is completed. They allow you to meet the Testable aspect of user stories when using INVEST.
They can cover both functional and non-functional criteria.

 

Example Acceptance Criteria

If we take the following as our user story:

As a registered user, I want to book onto a training course of my choice.

 

Some possible acceptance criteria could be:

  • Send confirmation email to user when booking is saved
  • Display correctly on PC, tablet and mobile phone.
  • The form cannot be submitted without entering all required data.

Acceptance criteria are specific to a user story, while the Definition of Done covers all stories.