Stripping or sweeping the membranes. If your cervix is already somewhat dilated and there's no urgent reason to induce, your practitioner can insert her finger through the cervix and manually separate your amniotic sac from the lower part of your uterus. This causes the release of prostaglandins, which may help further ripen your cervix and possibly get contractions going.
In most cases, this procedure is done during an office visit. You're then sent home to wait for labor to start, usually within the next few days. Many moms-to-be find this procedure uncomfortable or even painful, although the discomfort is short-lived.