參考答案
Estimating the effort for user stories is essential to help the team understand the scope of work, allocate resources effectively, and set expectations for delivery. Common methods for estimation include:
- Story Points: This is the most common method in Agile, where the team assigns a point value (usually based on a Fibonacci scale: 1, 2, 3, 5, 8, 13, etc.) to each user story based on its complexity, effort, and uncertainty. Higher story points indicate more effort and complexity.some text
- The team uses relative estimation by comparing user stories to each other. For example, if a story with 5 points seems twice as complex as a story with 3 points, the team can apply these relative values across the backlog.
- Planning Poker: A collaborative technique where team members use cards with numbers (often Fibonacci numbers) to estimate the effort of a user story. Everyone plays their cards simultaneously, and discrepancies in estimates are discussed until a consensus is reached.
- T-shirt Sizing: This method uses sizes (S, M, L, XL) to estimate the effort for user stories. It's a simpler approach than story points and is typically used for high-level estimation or when you want a rough estimate.
- Time-Based Estimation (Ideal Hours/Days): Some teams prefer to estimate user stories in hours or days. This approach is less common in Agile, as it can lead to overly detailed and inaccurate estimates, but it might be used for smaller or simpler tasks.
- Historical Data: If your team has worked on similar user stories in the past, you can use historical data from previous sprints to guide your estimations. This can increase the accuracy of estimates over time.
The goal of estimation is to create a shared understanding of the work's complexity, avoid surprises, and help prioritize the backlog.