SummaryIn the area studied in the Machakos Project the total fertility estimate amounts to 7·46, which is somewhat lower than reported in the preceding article (van Ginneken et al., 1984). Evidence is provided that the low observed infant mortality rate of 49 per 1000 live births is plausible; this rate is in accordance with the relatively low and rapidly declining infant mortality rates found in Kenya. No accurate estimate on adult mortality could be obtained, probably due to serious overstatement of ages in the older age groups.