Reference is made in this paper to cardiotocographic monitoring of labour by the principle of selective alarm recording, using trend memory scope, TMS-2, and a modified cardiotocographic recorder, FTS-101.--Upper or lower limits of individually preselected thresholds of foetal heart rate as well as upper limits of amplitude, frequency, basal tonus, and Montevideo units of uterine contractions were chosen as criteria by which to signal alarm. High-economy monitoring and savings on recording paper are some of the advantages provided by the system. Automatic alarm function as well as cardiotocographic recording twelve minutes prior to, during, and any time after an alarm signal proved to be sufficient for proper documentation of findings.