Rubber duck debugging is an informal way of debugging code. The method involves a programmer, while trying to find bugs in code (code inspection), keeping a rubber duck or another inanimate object nearby. Line by line, the programmer explains to the duck or other object what each segment of code is supposed to do. During this review, bugs in the application should become apparent. The method is a version of the thinking-aloud method, a procedure recognized as an effective way to speed up problem solving.

https://pl.wikipedia.org/wiki/Metoda_gumowej_kaczuszki