As suggested by Powell et al. (1995), it is a good strategy to adopt the methods of a static VRP to solve
DVRP problems. In a static VRP problem, the solution is commonly found after several phases. The approach
that is used in this study is composed of two phases: initial vehicle dispatching and route improvement. Route
improvement is further achieved by combining both intra-route improvement and inter-route improvement
where intra-route improvement tries to enhance the performance by switching orders within the assignment
of a vehicle and inter-route improvement exchanges the order between vehicles. Various algorithms are chosen
for different steps. The following will determine the system parameters.