https://en.wikipedia.org/wiki/Anna_Karenina_principle https://en.wikipedia.org/wiki/Anna_Karenina_principle "a deficiency in any one of a number of factors doo

https://en.wikipedia.org/wiki/Anna_Karenina_principle https://en.wikipedia.org/wiki/Anna_Karenina_principle "a deficiency in any one of a number of factors dooms an endeavor to failure. Consequently, a successful endeavor (subject to this principle) is one where every possible deficiency has been avoided."