What must auditors include in their report when a material weakness is found for an issuer?

When auditors identify a material weakness in internal controls for an issuer, it is crucial for them to provide a clear definition of what constitutes a material weakness and describe how it was identified. Including this definition helps ensure that users of the audit report understand the seriousness of the deficiency in internal controls. It gives context to the magnitude of the weakness and highlights the importance of addressing it to enhance the reliability of financial reporting.

This aligns with the principles of transparency and accountability in auditing, as stakeholders need to comprehend not only the existence of a material weakness but also its implications for the integrity of the financial statements. Therefore, providing a definition helps inform investors and regulators about the specific risks associated with the weakness, and aids in promoting corrective action.

The other options do not align with the necessary reporting standards. A disclaimer of internal controls, for instance, would not offer the clarity needed regarding the implications of identified deficiencies. Similarly, a positive assertion about management's effectiveness would be misleading if a material weakness exists, and simply summarizing audit results would not adequately address the specifics of the identified weakness.