Human n robotic workers?

A factory uses both human and robotic workers in its assembly lines. In some areas humans work with robotic arms, controlling their actions and observing the pieces as they come off the assembly line to detect any problems or failures. Humans are not allowed in other areas, while the robots are in operation. Safety mechanisms automatically shut down the robots if a human enters the restricted area. The factory recently added newer and more sophisticated robots, new software to control the robots and sensors to detect errors. These changes were expected to increase safety and production. However, production did not increase and the number of accidents more than tripled. Suppose you are a part of a consulting team hired by the government to investigate and write a report. What factors would you look to determine what the problems are? What questions would you ask? What additional information would you need? Is it ethical to do research aimed at improving artificial intelligence? What two precautions a programmer can take to avoid errors in software development? Describe one principle of human-interface design that is particularly important in safety-critical applications for both the human and robotic systems. Suggest some ways that can be implemented to provide a viable solution to this problem.