INVEST Criteria for Good User Stories

Today, we will explore the INVEST criteria for creating effective user stories. What does INVEST stand for? Can anyone venture a guess?

I think it might relate to how we value the stories?

Great start! INVEST stands for Independent, Negotiable, Valuable, Estimable, Small, and Testable. Each aspect plays a critical role in crafting user stories. Let’s break this down.

Why is it important for a story to be independent?

Being independent means the story can stand alone without relying on other stories. This allows for smoother progress during sprints. Let's remember this with the acronym 'INSURED' — Independent, Negotiable, Small, Usable, Estimable, and Deliverable.

Can you give an example of a non-independent story?

Sure! A story that says 'Create login functionality after profile setup' is dependent. Instead, say 'As a user, I want to log in so I can access my profile' — that's independent.

Why do our user stories need to be negotiable?

Good question! Negotiable stories promote discussion and flexibility. They should encourage dialogue between stakeholders to ensure the best outcome. At the end of this session, remember that the stories evolve through conversations!

Let’s dive deeper into each element of INVEST. Starting with ‘Valuable.’ Why do we need stories that deliver value?

To ensure what we build is useful to users, right?

Exactly! Valuable stories ensure we are solving real problems for our users. Can anyone explain how we determine value?

By talking to stakeholders and understanding their needs?

Spot on! Next is ‘Estimable.’ If a story is not clear, why would it be hard to estimate?

Because the team wouldn’t know how much work is involved?

Exactly right! A story must be clear for effort estimation. To aid memory, remember 'CLEAR' for Estimable — Clear, Logical, Estimable, Actionable, Reasonable.

What about stories being small? Why is that important?

Small stories are manageable and fit within sprints, which allows for quick feedback and adjustments. Let’s keep that in mind as we create our user stories.

We’ve talked about the INVEST criteria; now, let’s explore how acceptance criteria interconnect with these standards. Why do you think testable stories are necessary?

So we can verify if what was built meets the requirements?

Correct! Testability ensures that stakeholders know what 'done' means. Acceptance criteria clarify when a user story is completed. Who can share an example?

A password reset feature would require criteria like 'link expiry' and 'successful password change.'

Excellent! Gherkin language, for example, helps write these criteria clearly. Remember, clear acceptance criteria reduce ambiguity and align expectations between the development team and stakeholders.

So we should write acceptance criteria for every user story?

Absolutely! It’s part of ensuring stories are Testable. In Agile, each story should guide us to successful outcomes while encouraging ongoing discussions.

Now that we understand the INVEST criteria, let’s practice. Imagine you’re writing user stories for a new app. How would you ensure your stories are INVEST-compliant?

I’d start with writing stories that focus on user benefits, like ‘As a user, I want to track my fitness goals.’

Good start! How do we ensure this story is independent?

I could phrase it so that it doesn’t rely on other features, just standalone functionality.

Right! Let’s also consider the negotiating aspect. What can you change about the story to promote discussion?

I might say, ‘I want to view progress over time,’ allowing for input on visual representation or related features.

Exactly! You encouraged collaboration right there. Ending today’s lesson, can anyone summarize what we’ve covered about the INVEST criteria?

We’ve learned they need to be Independent, Negotiable, Valuable, Estimable, Small, and Testable!

Great job! Remember these criteria as we start creating user stories in our upcoming projects.