According to Stock (1992), logistics used to be defined as
management of materials from the point of origin to consumption.
However, this definition has expanded, and nowadays it includes
not only the management of physical flows, but also information
flow (Tibben-Lembke and Rogers, 2002). This direct logistic process
is known as Forward Logistics. In addition, there is also the reverse
logistics process, which is somewhat analogous to the forward
logistics process, but it refers only from the point of consumption to
the point of origin. This reverse flowis called Reverse Logistics. Fig.1
shows a flow diagram of forward and reverse logistic processes.