The correct answer to this open question is the following.
To help employees function effectively in job situations, human-factor psychologist designs products that are safe, effective, and easy to use.
These psychologists focus on improving products to help people do their jobs better, such as new technology, machines, software, and work environment so that workers can produce more things, enjoying what they do. The human factor tries to improve the security of the worker in the office or the fabric and works for having ideal working conditions that benefit the productivity of the company and the income of the employee.