tasks furthest apart are given priority as initial tasks

These initial tasks are assigned respectively to different (crane) task groups
as the first member of the group, then all other tasks are clustered according to proximity to them. Obviously, tasks furthest apart are given priority as initial
tasks. When multiple choices exist, overhead gantry crane running time can be reduced by selecting tasks with smaller feasible areas as initial tasks. The model provides
assistance in this respect by displaying graphical layout of tasks and a list of
the size of feasible area for each. After assigning an initial task to a group, the model searches for the closest remaining task by checking the size of overlapping area, then bridge gantry crane it into the task group to produce a new feasible
area corresponding to shape and size of feasible areas, illustrated in Fig. 9. In this case study, from the data and graphic output, the user may become aware that optimal locations led by test sets 1, 2, and 3(Fig. 3) are the best choices (balanced workload, conflict possibility, and efficient operation). Alternatively, in connection with site conditions such as availability of space for the crane position and ground conditions for the foundation,