W artykule autor opisuje wpływ, jaki wywarło twierdzenie Bayesa nie tylko na rozwój teorii prawdopodobieństwa i wnioskowania statystycznego, ale też jako niezwykle użyteczne narzędzie w podejmowaniu decyzji w sytuacjach niepewności.
EN
The Author recalls that 250 years ago in the British scientific circles ap-peared theorem of probability of causes, now called Bayes' theorem (formulated in 1763 by Thomas Bayes). It refers to the situation where there has been some events and once need to assess the probability of another incident which was the reason, i.e. what is cause and what is the effect of this event. Despite the passing years Bayes' approach in statistical surveys for the conditional probability of occurrence is constantly confirmed and important. (original abstract)