The Swedish Society of Obstetrics and Gynaecology has set up principles for systematic postgraduate education in ultrasonography in obstetrics and gynaecology. The education is available at three levels: (1) a basic course; (2) an advanced course; and (3) special courses. The subjects included in each course are described. It is expected that this programme of formal education will lead to improvement in the Swedish gynaecologists' knowledge of ultrasonography.