This lesson covers the responsibilities of a CPA firm in maintaining a strong system of quality control, emphasizing the importance of staff training, continuing professional education, and thorough checking processes. The lesson also discusses the application of quality control procedures in audit and non-audit engagements and explores factors to consider when determining the use of work from the internal audit function, specialists, or component auditors. Finally, the lesson delves into the nature and scope of the work of internal auditors and component auditors that can be used in engagements. Throughout the lesson, Nick Palazzolo provides in-depth insights and helps build a strong understanding of these concepts to prepare for the exam.