, Le processus commence par une analyse des incidents et accidents, afin de définir les causes, et traiter seulement les causes humaines

, Nous identifions le(s) phénotype(s) correspondant(s) à ce génotype c. Nous décrivons le génotype dans le tableau HEECA (présenté dans la section 1.2) d. Nous identifions et décrivons la probabilité d

, Nous vérifions s'il y a d'autres erreurs

, Si oui, nous reprenons à l'étape 2

, Si non, le processus est terminé

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. L'opérateur-«-disable,

L. , Suspend-resume » permet de décrire que le démarrage de la tâche T2 entraîne l'arrêt temporaire de la tâche T1 ; la tâche T1 peut être redémarrée à tout moment puis interrompue à nouveau par la tâche T2

L. , Order independant » permet de décrire que l'utilisateur peut choisir s'il effectuera la tâche T1 ou la tâche T2 en premier. Cet opérateur indique aussi que la tâche choisie pour être exécutée en premier sera terminée avant de passer à la suivante