This paper presents a systematic set of procedures in accordance with Target-Oriented Design(TOD) methodology for the development of a robot arm assisting PWD at working place. As the outcome of TOD, a robot arm has been designed and prototyped to carry out two tasks, ‘circuit test of PCB’ and ‘soldering inspection and repairing of PCB with solder’. The robot has been used and evaluated by handicapped workers at an assembly line for electronic devices of a company in Korea.