REA’s Essentials provide quick and easy access to critical information in a variety of different fields, ranging from the most basic to the most advanced. As its name implies, these concise, comprehensive study guides summarize the essentials of the field covered. Essentials are helpful when preparing for exams, doing homework and will remain a lasting reference source for students, teachers, and professionals. Auditing includes audit functions, audit reports, professional ethics, legal liability, engagement planning, internal control structure in manually operated systems, internal control structure in EDP systems, evidence gathering, audit techniques, audit sampling, revenue and collection cycles, acquisition and payment cycles, payroll and inventory cycles, financing and repayment cycles, and other types of engagements.