Known unknowns vs unknown unknowns. "I know how this should work but something's wrong" vs "how am I supposed to do this? Should I do this? Will this other thin

Known unknowns vs unknown unknowns. "I know how this should work but something's wrong" vs "how am I supposed to do this? Should I do this? Will this other thing change?" Hackers are fine with it, but system architects hate that uncertainty.