to whether the te has put the next pod on the smif arm after block 34 line test 26 the system loops back to block 12 fig2 shows the computer system 50 employed to control a fabrication plant in accordance with the present invention system 50 includes a central computer system 60 which comprises a cpu 61 a terminal 67 with monitor 62 and keyboard 63 connected to the cpu 61 or receiving sending data respectively from to the cpu 61 a random access memory 65 and a dasd 64 associated with the cpu 61 are shown connected for bidirectional communication with cpu 61 line 76 connects from cpu 61 to line 176 which connects through the interface of factory control computer 70 through line 276 to cpu 71 of computer 70 which is in a fabrication plant 90 the factory control computer system 70 comprises a cpu 71 a terminal 77 with monitor 72 and keyboard 73 connected to the cpu 71 for receiving sending data respectively from to the cpu 71 a random access memory 75 and a dasd 74 associated with the cpu 71 are shown connected for bidirectional communication with cpu 71 line 86 connects from cpu 71 to line 186 which connects through the interface of factory control computer 70 out to the shop floor 87 elements of the system fig3 is a chart showing a control system for operating a system considered before reaching the system shown in fig4 the promis sam and eqps information is tracked alongside the above entries in fig3 fig4 is a chart showing a control system for operating a system in accordance with the system of this invention as.