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Summary. The uterine activity of women during induced labour was analysed with a real-time Commodore PET 2001 series microcomputer. The active contraction area was measured in torr-min (1 torr = 0.133 kPa) per 10 min epochs [uterine activity unit (UAU)/10 min]. Surgical induction was followed immediately by administration of a geometric oxytocin infusion and all patients received epidural analgesia. Twenty-eight primigravidae for whom inductographic and partographic progress were normal had a mean ‘stable phase’ uterine activity of 118±2 SD 43 UAU/10 min (≡942±2 SD 343 kPas/10 min) whereas 15 multiparae had a mean ‘stable phase’ of 83±2 SD 34 UAU/10 min (≡662±2 SD 271kPas/10min). This difference was significant (P<0.01). The construction of uterine activity charts is described and their clinical application discussed.