Affinity Estimation
A collaborative estimation technique where team members silently group work items by relative size to quickly estimate large backlogs.
Also known as: Affinity Grouping, Wall Estimation, Bucket Estimation
Category: Techniques
Tags: agile, estimation, planning, collaboration, teams
Explanation
Affinity Estimation (also called Affinity Grouping or Wall Estimation) is a fast, collaborative estimation technique designed to size a large number of items quickly. Instead of estimating each item individually, the team sorts items into relative size groups.
## How it works
1. **Set up columns** - Create columns on a wall or board representing sizes (e.g., XS, S, M, L, XL or Fibonacci values)
2. **Seed the board** - Place one well-understood item in each column as a reference point
3. **Silent sorting** - Team members take turns placing items in columns based on relative size. No talking during this phase
4. **Review and adjust** - Once all items are placed, the team discusses any items that seem misplaced
5. **Move items** - Anyone can move items, but if an item moves back and forth, it's flagged for group discussion
6. **Finalize** - The team agrees on final placements
## Why silent sorting works
- **Prevents anchoring** - No one influences others with spoken opinions
- **Leverages diverse perspectives** - Everyone's judgment contributes equally
- **Surfaces disagreements visibly** - Items that bounce between columns reveal hidden complexity or misunderstanding
- **Fast** - A team can size 50-100 items in under an hour
## When to use it
- **Large backlog sizing** - When you have dozens or hundreds of items to estimate
- **Initial release planning** - Getting a rough sense of total scope
- **New teams** - When the team hasn't established a velocity baseline yet
- **Portfolio-level planning** - Comparing effort across multiple projects
## Advantages over other techniques
- Much faster than Planning Poker for large numbers of items
- Naturally produces a relative ordering, not just point values
- Entire team participates without long discussions per item
- The physical movement keeps energy high
## Limitations
- Less detailed than per-item estimation techniques
- Requires physical or virtual board space
- Works best for items at a similar level of decomposition
- Not suitable when detailed estimates are needed for sprint commitments
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