Final answer:
Customer feedback is not collected through an internal audit; it is external data used to assess product quality or customer satisfaction.
Step-by-step explanation:
All of the following are data collected through an internal audit except customer feedback. An internal audit typically involves gathering information from within an organization to assess its operations and performance. This can include reviewing financial statements, assessing employee performance evaluations, and making sales forecasts. On the other hand, customer feedback is an example of external data which organizations use to evaluate the quality of their products or services, often through methods like in-depth interviews, focus groups, and analysis of content sources. Such feedback is part of market research which can involve gathering quantitative data and can be key for root cause analysis when identifying issues affecting product quality or customer satisfaction.