In learning and problem-solving, an "error" is the difference between what we aimed to achieve and the actual result. It shows how far we are from the desired outcome and helps us understand what needs adjusting. Errors aren’t failures; they’re valuable feedback, guiding us to make improvements in each new attempt. By identifying and reducing errors through practice and adjustments, we gradually get closer to the goal. In this way, errors are essential to learning, as they highlight what doesn’t work and point us toward what might.

Essentially, there are two type of errors:

the "bad" errors (often happen only once)

the "innocent" (unpleasant but useful minor misstep) 

Turn to Your neighbour, discuss the question "what was the worst error (e.g. the biggest fuckup) You ever did/caused in Your life". After 5 minutes, each couple will be asked to present at least one such error to the plenum.

"Errare humanum est, sed in errare perseverare diabolicum" (Seneca, 62 A.D.)

To err is human, to stay in error diabolical.