This book is an amended and somewhat shorter version of my doctoral
thesis which I submitted to the Australian National University in 1976,
and subsequently edited at the Netherlands Interuniversity Demographic
Institute in 1977. The work falls naturally into two parts. The first is
concerned with the construction and validation of a model, and the
second with its application as an experimental tool. In the first part,
comprising Chapters One to Four, an examination of historical and
contemporary models of population growth led to the decision to study
changes in fertility by means of a biological micro simulation model.
The reasons supporting the choice of such a model were discussed, and a
search of the literature produced the data to be used as model input.
The effects of varying the input were examined and then the model output
was tested against Hutterite data. The main emphasis of the second part
of the work, comprising Chapters Five to Seven, was the testing of the
effect on the fertility of one society of variations in the duration of
the post partum period of non-susceptibility to conception, and in the
level of infant and child mortality. Further simulations were performed
to discover the impact on fertility of the use of contraception to
attain different family sizes, both with and without the additional
effect of infant and child mortality.