The authors describe their approach which was designed to meet three imperatives, namely: --to prevent severe foetal distress, --to detect severe foetal distress by systematic use of the cardiotocography, --to avoid unnecessary interventions by supervising the metabolic state of the mother and the foetus which makes it possible to distinguish foetal acidosis by hypoxia necessitating rapid intervention from foetal acidosis of maternal origin for which extraction is not generally necessary. Their action has made it possible to reduce the number of caesarian during labour which achieving extremely low perinatal mortality and morbidity rates.