This monograph is one of the first to emphasize analyzing a class of
single item inventory systems from a genuine renewal-theoretic approach.
It also provides a unified and simplified account of the recent progress
made in the area of Inventory Systems. In addition to featuring new
results on the optimality conditions, it bounds on optimal policies for
the general continuous review model. This monograph is written for
researchers and practitioners and can be used as a textbook at a
graduate level.