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In light of the recent changes in the internal audit (IA) landscape, the role of auditors has undergone a significant transformation. This paper aims to investigate the effects of applying Lean Six Sigma (LSS) techniques on the effectiveness and efficiency of IA.

The study used a quantitative approach, surveying Iranian internal auditors with a sample size of 384 participants. Data analysis involved confirmatory factor analysis and structural equation modeling.

The analyses demonstrate a significant association between LSS application and IA effectiveness and efficiency. In addition, an exploratory analysis indicates that the application of LSS techniques by less experienced internal auditors had a reverse effect on IA function quality as a component of IA competency. However, IA motivation factors, including education and position, did not mediate the impact of LSS on IA effectiveness and efficiency.

This study was conducted with Iranian internal auditors, which may limit the generalizability of the findings to other countries. However, the primary academic implication of this research lies in its novel perspective on emphasizing the concept of continuous improvement in IA through the use of LSS techniques. By focusing on the need for internal auditors to add value to the business in new ways, this research contributes to the literature on IA quality.

This study has significant implications for the effective management of IA departments. By promoting the application of LSS techniques in IA, lean auditing is enhanced, and IA can create value by improving the quality of its functions. Moreover, IA regulators can benefit from this study as it emphasizes providing guidance and training on LSS techniques to enhance IA skills.

This research is pioneering in applying LSS methodology to enhance the effectiveness and efficiency of internal auditing. It also considers the integration of lean thinking into current audit practices, making it unique and valuable in internal auditing research.

This study aims to investigate factors that drive or deter audit firms (AFs) from disclosing audit quality (AQ) information to stakeholders in Iran. Furthermore, information items that should be contained in their disclosures are examined.

The study followed an interpretive approach. In this regard, 21 semi-structured and face-to-face interviews were conducted to explore the viewpoints of audit partners and investment managers. Interviewees were selected by snowball sampling method. The transcripts of audio records were prepared, and a thematic perspective was applied to evaluate transcriptions.

Participants’ interpretations indicate that certain factors, such as signaling to stakeholders, active audit committees and investor demand, promote transparency among Iranian AFs. Nonetheless, this inclination is deterred by some concerns, including poor AQ, lack of financial resources, lack of legal enforcement, fear of raising stakeholders’ expectations, inactive professional associations and contextual factors which should be addressed. Interviewees believe five items should be contained in AFs’ disclosures to enhance transparency.

This study contributes to recognizing factors explaining AFs’ behavior in the context of an Islamic country. Furthermore, the type of disclosure that should be contained can provide good insight for standard setters or oversight bodies.

The semi-structured interviews shed light on the contextual factors that influence transparency within the accountancy profession, either enabling or hindering it. Additionally, it is crucial to consider each country’s unique characteristics when determining the disclosure items in transparency reports.