Les niveaux de connaissance en langue ont été classés et définis par le Conseil de l'Europe. Cette norme européenne, appelée cadre européen commun de référence, est acceptée et reconnue dans tous les pays de l'Union Européenne. Elle détermine précisément les compétences que doit posséder l'apprenant pour communiquer dans certains contextes.
Scientists at a research institute in Seattle in the United States are studying people’s relationships. They are using mathematics to predict the success or failure of marriages. They have studied five hundred couples so far. They say that their predictions are over ninety per cent correct. They can predict which marriages will end in divorce and which couples will stay together forever.
They record a couple’s conversations on video. They also measure physical reactions and emotions. They calculate the negative and positive interactions in a conversation. They then use a mathematical model to predict the couple’s future.
They have found that a sense of humour is an important ingredient to a successful marriage.
Niveau 2 – Intermédiaire 
