# AIelsen FDE Academy / Metric contract

For education or authorized internal work. Do not include secrets, customer identities or keys. Examples are teaching scenarios; actual legal and commercial arrangements require professional review.

## How to use

Read the related lesson. Give a decision, evidence location, version and owner for each field. Mark unknowns as unverified; do not have a model invent facts.

### 1. Name and version

- Content / decision:
- Evidence / version:
- Owner / open question:

### 2. Meaning

- Content / decision:
- Evidence / version:
- Owner / open question:

### 3. Numerator

- Content / decision:
- Evidence / version:
- Owner / open question:

### 4. Denominator

- Content / decision:
- Evidence / version:
- Owner / open question:

### 5. Cohort

- Content / decision:
- Evidence / version:
- Owner / open question:

### 6. Complete window

- Content / decision:
- Evidence / version:
- Owner / open question:

### 7. Timezone

- Content / decision:
- Evidence / version:
- Owner / open question:

### 8. Exclusions

- Content / decision:
- Evidence / version:
- Owner / open question:

### 9. Refunds

- Content / decision:
- Evidence / version:
- Owner / open question:

### 10. Identity rules

- Content / decision:
- Evidence / version:
- Owner / open question:

### 11. Sources

- Content / decision:
- Evidence / version:
- Owner / open question:

### 12. Owner

- Content / decision:
- Evidence / version:
- Owner / open question:

### 13. SQL or formula

- Content / decision:
- Evidence / version:
- Owner / open question:

### 14. Three boundary tests

- Content / decision:
- Evidence / version:
- Owner / open question:

## Practice and review

Teaching example: 240 repeat buyers yield 24% with 1,000 fully observed members and 20% with 1,200 imported accounts. The four-point gap is a definition change, not model improvement. Reproduce the calculation and explain the exclusions.

- [ ] Denominator and window are reproducible.
- [ ] No post-hoc definition changes to hide failure.
- [ ] Exclusions and responsibilities are explicit.

## Revision log

| Version | Date | Change | Evidence | Owner |
|---|---|---|---|---|
| v0.1 | | | | |

AIelsen FDE Academy · Educational worksheet · 2026