This report sets out the major findings from investigations into the demographic data collected as part of the National Income Dynamics Study (NIDS). The report concerns itself primarily with three distinct investigations: fertility; child mortality and adult mortality. Each of these will be presented in turn. We have not prepared a section on the basic demography (age and sex structure of the population), as we presume that this will be covered in the report on the realisation of the sample, and the derivation of weights used or on migration, which is the topic of a separate report. However, where our findings relate to that material, comment will be offered.