This document discusses mergers and acquisitions and their impact on auditor independence and a firm's ability to continue an audit engagement. When a client becomes a related entity due to a merger or acquisition, the firm must identify previous/current interests and relationships and evaluate any threats to independence. The firm must terminate any prohibited interests/relationships by the effective date, or if not possible, evaluate the threat and discuss with governance. The firm can only continue as auditor if certain criteria are met, such as terminating interests within 6 months and applying transitional measures. The firm must also consider if any threats would compromise objectivity even if requirements are met.