What area are human factors psychologists researching when they study what steps people take to successfully wash their hands before performing surgery?

Answer: Task analysis.

Explanation: Human Factors psychology is defined as the study of how workers interact with the work tools and how to create and enhance those to optimize productivity, health and safety of workers. For instance, Human Factors psychologists research on the area of task analysis when they study what steps people take in order to successfully wash their hands before performing a surgery.