Moyer and Gupta (1997) agreed that the component sequencing problem for the CS machine could be formulated as the TSP provided that the locations of the components on the board were assigned prior to the determination of the placement sequence. The board sequencing heuristic (BSH) was developed to solve the problem. The idea of the BSH was to rearrange the placement order by swapping a pair of components in the current tour to obtain a better solution.