We use the admiralty scale where possible to score information:
| – | 1 (Confirmed) | 2 (Probably True) | 3 (Possibly True) | 4 (Doubtfully True) | 5 (Improbable) | 6 (Cannot be Judged) |
|---|---|---|---|---|---|---|
| A (Completely Reliable) | A1 | A2 | A3 | A4 | A5 | A6 |
| B (Usually Reliable) | B1 | B2 | B3 | B4 | B5 | B6 |
| C (Fairly Reliable) | C1 | C2 | C3 | C4 | C5 | C6 |
| D (Not Usually Reliable) | D1 | D2 | D3 | D4 | D5 | D6 |
| E (Unreliable) | E1 | E2 | E3 | E4 | E5 | E6 |
| F (Cannot be Judged) | F1 | F2 | F3 | F4 | F5 | F6 |
Reliability of Source:
- A: Completely reliable. The source has a history of complete accuracy.
- B: Usually reliable. The source has a history of mostly accurate information, with few errors.
- C: Fairly reliable. The source has a history of being about as accurate as not.
- D: Not usually reliable. The source has a history of more inaccurate than accurate information.
- E: Unreliable. The source is known to provide inaccurate information.
- F: Reliability cannot be judged. There is not enough information to assess the reliability of the source.
Credibility of Information:
- 1: Confirmed by other sources. The information is confirmed by other independent and reliable sources.
- 2: Probably true. The information is not confirmed, but is likely to be true.
- 3: Possibly true. The information is not confirmed, and its truth is equally likely as its falsehood.
- 4: Doubtfully true. The information is not confirmed, and is likely to be false.
- 5: Improbable. The information is not confirmed, and is likely to be false, based on the source’s history or the nature of the information.
- 6: Truth cannot be judged. There is not enough information to assess the truth of the information.
Further Reading:
https://www.misp-project.org/taxonomies.html#_admiralty_scale
https://www.threat-intelligence.eu/methodologies/#the-admiralty-scale-also-called-the-nato-system