with an objective to identify the facility locations and respective flow quantities between them (a
typical decision of any facility allocation problem). In addition to this around 11% of the models
also included the decision of identifying the inventory at each period in the optimal solution. The
success of sustainability through GrLND is incomplete without taking the contextual factors (e.g.
mode of reverse logistics, timing of collection, differential quality of returned products etc.) into
account while developing a model. Hence, future researcher may also include the decision
variables in the model which can take the factors into account.