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The GAMAB principle(Globalement au moins aussi bon – Generally at least as good) means: A new system should be at least as safe or low-risk as any existing comparable system (cf. European railway standard EN 50126, 1997).

This principle sets the current level of safety as a minimum requirement. New
Systems must at least reach this level. Technical progress is thus developed step by step.
It is based on the premise that the risk of the comparable system already in operation is deemed to be accepted.

The principle is applied analogously in the Eisenbahn-Bau- und Betriebsordnung EBO, §2 (General requirements) paragraph (2):

Deviations from the recognised rules of technology are permitted if at least the same level of safety is demonstrated as with compliance with these rules. (Proof of equal safety)

In the chemical industry, the term “best practice” is used for this purpose.

In France, it is a common risk acceptance criterion.[1]

See also

  • Minimum endogenous mortality
  • Risk analysis
  • Risk management
  • Probabilistic safety analysis

Individual references

  1. 1] (PDF; 13 kB), Safety Corner – What is GAMAB?