Independent execution of procedures or controls by auditor originally performed as part of entity's Internal control Analysis of plausible relationships (1.e., trend, ratio, and reasonableness analysis) Audit work conducted to unden and entity and its environment including Internal control A direct written response to the auditor from a third party Checking the mathematical accuracy of information (1.e., manually or technology) Looking at a process or procedure being performed by others Examination of accounting records and source documents (l.e., vouching and tracing) Inspection Observation Inquiry Confirmation Recalculation Reperformance Analytical Procedures