Last week I described the bones of the user story. Briefly, a user story is a description of an objective a person should be able to achieve when using your website/application/software, written in the following format
As an [actor] I want [action] so that [achievement]
As a Flickr member I want to be able to assign different privacy levels to my photos so I can control who I share which photos with.
This post adds some flesh to the idea of user stories, in the shape of acceptance criteria.
Where are the details?
At first glance, it can seem like user stories don’t provide enough information to get a team moving from an idea to a product.
Nearly 10 years ago, Ron Jeffries wrote about the Three C’s of the user story:
- Card – stories are traditionally written on notecards, and these cards can be annotated with extra details
- Conversation – details behind the story come out through conversations with the Product Owner
- Confirmation – acceptance tests confirm the story is finished and working as intended.
In a project following an Agile process, user stories are discussed in meetings with the Product Owner (the person who represents the customer for the thing you’re developing, and who writes the user stories) and the development team. The user story is presented, and the conversation starts. For example:
As a conference attendee, I want to be able to register online, so I can register quickly and cut down on paperwork
Questions for the Product Owner might include:
- What information needs to be collected to allow a user to register?
- Where does this information need to be collected/delivered?
- Can the user pay online as part of the registration process?
- Does the user need to be sent an acknowledgment?
The issues and ideas raised in this Q and A session are captured in the story’s acceptance criteria.
Acceptance criteria define the boundaries of a user story, and are used to confirm when a story is completed and working as intended.
For the above example, the acceptance criteria could include:
- A user cannot submit a form without completing all the mandatory fields
- Information from the form is stored in the registrations database
- Protection against spam is working
- Payment can be made via credit card
- An acknowledgment email is sent to the user after submitting the form.
As you can see, the acceptance criteria are written in simple language, just like the user story. When the development team has finished working on the user story they demonstrate the functionality to the Product Owner, showing how each criterion is satisfied.
Including acceptance criteria as part of your user stories has several benefits:
- they get the team to think through how a feature or piece of functionality will work from the user’s perspective
- they remove ambiguity from requirements
- they form the tests that will confirm that a feature or piece of functionality is working and complete.
So that’s a brief introduction to acceptance criteria and how they fit in with user stories. For more examples of how acceptance criteria work, I really recommend this post by Sandy Mamoli (Sandy is a Wellington Agile coach and scrum master, who we work with on Digital New Zealand). You might also like to check out this presentation on effective user stories by Mike Cohn.
Stay tuned for our blog post, where I’ll talk about how user stories get used in the development process, from the perspective of the Product Owner.