95 ISSUE/PROBLEM (society issue, issue that is seen relevant from pupils’ perspective, issue linked to some nature phenomenon or phenomenon from pupils’ everyday life) In the painting, the character is a harlequin from the Commedia dell’arte, an Italian improvisational theater popular in the Middle Ages. Theatrical performances were based on ready-made characters whose looks and relationships with each other were predetermined. The intriguing harlequin character constantly plays games based on cheating and cheating. A game that often feels like cheating is based on knowledge: by calculating and estimating probabilities, winning is possible. Test hands-on the phenomena of probability on games. INVESTIGATIONAL STAGE