In another case, suppose, due to the change in the
customer requirement, the loading step has to read the
ID (bar code) of the wafer before loading it. An
engineener will be asked to insert a scanning stage to
the loading step. He or she will simply look at the
Step_Load design table and logically decide that the
scanning stage should be inserted after the wafer
alignment but before the WC pressurization. The new
wafer ID reading is designated as FR/DP222543.4 and
the subsequent stages are shifted by one. The engineer
may also recommend to modify the wafer alignment
procedure to provide the required precision for the
scanner head.