This document summarizes sections of the International Ethics Standards Board for Accountants regarding professional accountants in public practice. It discusses threats to compliance with fundamental principles such as self-interest, self-review, advocacy, familiarity, and intimidation. Examples are provided for each type of threat. It also discusses safeguards at the firm-wide and engagement level that can address threats, such as leadership emphasizing compliance, quality control policies, and restrictions on non-assurance services for assurance clients.