A study of demographic models helps to understand the observed phenomena in a better way and to implement intervention programs and population policies. The main objective of this study is to develop some models on demographic variables viz., post-partum amenorrhoea (PPA), breastfeeding (BF), first birth interval (FBI), fertility and stable population theory. Differentials and determinants of these factors have also been studied. Chapters II, III, IV and V have discussed the behavior of human fertility in some way or others. Impact of migration, increasing age at marriage, use of...