Story points are related to time, but they are not the same as time.
A story point is a relative estimate of the size of a user story. It considers:
| Factor | Meaning |
|---|---|
| Effort | How much work may be required |
| Complexity | How difficult the work is |
| Uncertainty | How unclear or risky the work is |
| Dependencies | Whether the story depends on other people, teams, systems, or information |
Your slides explain that story points are used for relative sizing and consider complexity, effort, uncertainty, and dependencies, while hours are better used for task breakdown inside a sprint.
Simple example
| Story | Story points | Possible meaning |
|---|---|---|
| Add a button label change | 1 point | Very small, low risk |
| Create login page | 3 points | Moderate work |
| Build password reset with email verification | 5 points | More effort and testing |
| Build recommendation engine | 13 points | Large, complex, uncertain |
A 5-point story does not always mean 5 hours. It means the team believes it is roughly bigger than a 3-point story and smaller than an 8-point story.
How story points connect to time
Story points become useful over multiple sprints through velocity.
Velocity = average story points completed per sprint.
For example:
| Sprint | Completed story points |
|---|---|
| Sprint 1 | 22 |
| Sprint 2 | 26 |
| Sprint 3 | 24 |
Average velocity = about 24 story points per sprint.
So if the remaining backlog has 96 story points, the team may estimate:
96 ÷ 24 = 4 sprints
So story points help forecast time at the sprint/release level, not at the individual-hour level.
Explanation
You can say:
Story points are not hours. Story points are a relative measure of story size. After a team completes a few sprints, we can use their average velocity to estimate how many sprints are needed to finish the backlog.
Good classroom warning
Avoid saying:
1 story point = 1 hour
That is usually not correct.
Better:
For this team, based on past performance, 20 story points may usually fit into a 2-week sprint.
So the relationship is:
Story points → help calculate velocity → velocity helps forecast time.
