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Chain Risk model


Matrixcombined AIAG-VDA AP + ISO 26262 ASIL
ModelAIAG-VDA AP + ISO 26262 ASIL combined 2
Description
Score formula(S + O) / 2
Other matrices here A level cannot be checked without knowing that a second ruler exists and was not the one used.

Rules, in order

Evaluated top to bottom; the first match assigns the level. The same rules in any other order are a different matrix.

LevelApplies when
ASIL_DS is in class asil AND S >= S3 AND O >= E4 AND C >= C3
ASIL_CS is in class asil AND S >= S3 AND O >= E4 AND C >= C2
ASIL_CS is in class asil AND S >= S3 AND O >= E3 AND C >= C3
ASIL_CS is in class asil AND S >= S2 AND O >= E4 AND C >= C3
ASIL_BS is in class asil AND S >= S3 AND O >= E4
ASIL_BS is in class asil AND S >= S3 AND O >= E3 AND C >= C2
ASIL_BS is in class asil AND S >= S3 AND O >= E2 AND C >= C3
ASIL_BS is in class asil AND S >= S2 AND O >= E4 AND C >= C2
ASIL_BS is in class asil AND S >= S2 AND O >= E3 AND C >= C3
ASIL_BS is in class asil AND S >= S1 AND O >= E4 AND C >= C3
ASIL_AS is in class asil AND S >= S3 AND O >= E3
ASIL_AS is in class asil AND S >= S3 AND O >= E2 AND C >= C2
ASIL_AS is in class asil AND S >= S3 AND O >= E1 AND C >= C3
ASIL_AS is in class asil AND S >= S2 AND O >= E4
ASIL_AS is in class asil AND S >= S2 AND O >= E3 AND C >= C2
ASIL_AS is in class asil AND S >= S2 AND O >= E2 AND C >= C3
ASIL_AS is in class asil AND S >= S1 AND O >= E4 AND C >= C2
ASIL_AS is in class asil AND S >= S1 AND O >= E3 AND C >= C3
QMS is in class asil
AP_HS >= 9
AP_HS >= 7 AND O >= 7 AND D >= 7
AP_HS >= 5 AND O >= 9 AND D >= 9
AP_MS >= 7 AND O >= 4
AP_MS >= 5 AND O >= 7 AND D >= 5
AP_MS >= 3 AND O >= 9 AND D >= 8
AP_LS >= 5 AND O >= 4
AP_LS >= 3 AND O >= 7
AP_LS >= 1
NEGLotherwise

Scales

The admissible values of each input, and what each one means. A value with a position and no verbal definition is a scale point nobody can apply consistently — two assessors will not place the same hazard on it — so the undefined ones are marked rather than left to be noticed.

S — severity transform: identity

ValuePositionMeaningClass
1 0.1 1 – No effect
2 0.2 no definition
3 0.3 no definition
4 0.4 no definition
5 0.5 no definition
6 0.6 no definition
7 0.7 7 – High, vehicle operable
8 0.8 no definition
9 0.9 9 – Hazardous with warning
10 1 10 – Hazardous without warning
S1 1 S1 – Slight injury asil
S2 1.1 S2 – Serious injury asil
S3 1.2 S3 – Life-threatening asil

O — occurrence transform: log_normalized

ValuePositionMeaningClass
1 7e-07 O1 – ≤1 in 1,500,000
2 7e-06 O2 – 1 in 150,000
3 7e-05 O3 – 1 in 15,000
4 0.0005 O4 – 1 in 2,000
5 0.003 O5 – 1 in 400
6 0.012 O6 – 1 in 80
7 0.05 O7 – 1 in 20
8 0.12 O8 – 1 in 8
9 0.33 O9 – 1 in 3
10 1 O10 – ≥1 in 2
E1 0.001 E1 – Very low exposure (<1%) asil
E2 0.01 E2 – Low exposure (1–10%) asil
E3 0.1 E3 – Medium exposure (10–90%) asil
E4 0.9 E4 – High exposure (>90%) asil

D — detection transform: log_normalized

ValuePositionMeaningClass
1 7e-07 D1 – ≤1 in 1,500,000
2 7e-06 D2 – 1 in 150,000
3 7e-05 D3 – 1 in 15,000
4 0.0005 D4 – 1 in 2,000
5 0.003 D5 – 1 in 400
6 0.012 D6 – 1 in 80
7 0.05 D7 – 1 in 20
8 0.12 D8 – 1 in 8
9 0.33 D9 – 1 in 3
10 1 D10 – ≥1 in 2

C — controllability transform: identity

ValuePositionMeaningClass
C1 0.01 C1 – Simply controllable
C2 0.5 C2 – Normally controllable
C3 0.99 C3 – Difficult to control

Levels

LevelMeaning
ASIL_DASIL D
ASIL_CASIL C
ASIL_BASIL B
ASIL_AASIL A
QMQuality Managed
AP_HAP: High
AP_MAP: Medium
AP_LAP: Low
NEGLNegligible



KF  ·  49 items, 54 edges, 127 revisions  ·  last write 2026/09/05 19:57:45.133  ·  config rev 019ec013-99e4-77f4-89db-d53d0eb57028