Final answer:
The cause-and-effect diagram is the quality tool that uses a visual diagram to identify problem areas in a process.
Step-by-step explanation:
The quality tool that utilizes a visual depiction of a process to help identify problem areas is the cause-and-effect diagram, also known as a fishbone diagram or Ishikawa diagram. This tool is used to identify, explore, and display the possible causes of a specific problem or quality characteristic. Other tools mentioned, such as the histogram, scatter diagram, and Pareto chart, serve different purposes. A histogram is used for showing the frequency distribution of a set of data. The scatter diagram helps to show the relationship between two variables, and a Pareto chart displays the important factors and can highlight the most significant among a (typically large) set of factors.