7. Conclusion
In conclusion, changes in the financial reporting environment, such as increasingly complex estimates, the nature of clients’ operations, and greater technology use, are prompting auditors’ use of specialists on audit engagements. These specialists are highly-skilled experts in their domain, who help auditors assess risk and/or perform procedures to support the audit opinion. Currently, the lines of research on valuation, tax, IT audit, and forensic specialists are growing independently of each other, so it is important to review these literatures collectively, particularly given the PCAOB’s (2017b) amendments to auditing standards on specialist use and that there are common issues across these literatures. This synthesis consolidates the extant research regarding auditors’ use of these four types of specialists to show: (1) specific factors and dimensions of those factors that influence the nature, timing and extent of specialists’ involvement (e.g., risks and complexities); (2) factors that impact the effectiveness of auditorspecialist interactions, both when working with auditors’ specialists and management’s specialists; and (3) how these factors affect audit outcomes and audit quality. Throughout this synthesis, I also suggest numerous opportunities for future research on these topics and note where individual specialist research streams investigate certain matters that other literatures could build upon.