There are many reasons for investigating an accident or incident. Benner (1980) recognises that each purpose is related to the perceptions the person or group have on the causes of the accident. Within the Dutch railway sector, the main reason is to identify the causes in order to take the most (cost) effective counteractions. The Dutch Railway Inspectorate currently uses MISOS (Anon,2005) to identify the causes and context factors of a wide array of incident and accident types. This database is highly detailed and specific to each incident type and thus prevents a comparative analysis of the causal pathways between different incident types.