A chain is only as strong as its weakest link

Meaning: A group's effectiveness is limited by its weakest member.

Origin: The Scottish philosopher Thomas Reid wrote in Essays on the Intellectual Powers of Man (1786) that in any chain of reasoning, the conclusion can be no stronger than the weakest link of the chain. He meant arguments, but the image transferred easily to anything whose strength depends on a single point of failure.

Equivalents in French, Spanish, Japanese, and German

  • French: Une chaîne n'est jamais plus solide que son maillon le plus faible (literally: A chain is never stronger than its weakest link)
  • Spanish: Una cadena es tan fuerte como su eslabón más débil (literally: A chain is as strong as its weakest link)
  • Japanese: 鎖は最も弱い環の強さ (Kusari wa mottomo yowai wa no tsuyosa) (literally: A chain is the strength of its weakest link)
  • German: Eine Kette ist nur so stark wie ihr schwächstes Glied (literally: A chain is only as strong as its weakest link)

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