Data analytics is the most efficient technique to identify patterns and anomalies that may indicate the splitting of planned purchases to avoid the approval process. By applying data analytics, the internal auditor can analyze the entire dataset to detect unusual patterns, such as multiple purchases just below the approval threshold made within a short timeframe. This method is more effective than random sampling or manual examination as it can quickly and accurately identify instances of potential malpractice across large volumes of transactions.References:
* The Institute of Internal Auditors (IIA) - Practice Guide: Data Analytics

Best practices for assurance engagement communication activities include defining the methods and timing of engagement communications during the "communicate" phase. This ensures that all stakeholders are aware of how and when they will receive information about the engagement, facilitating clear and effective communication. While it is important to communicate significant observations to relevant parties, including the audit committee if necessary, and to escalate issues as appropriate, the method and timing of these communications are crucial for maintaining clarity and coordination throughout the engagement. Reference:
The IIA's International Standards for the Professional Practice of Internal Auditing (Standards), specifically Standard 2420 - Quality of Communications.
The IIA's Practice Guide on Communicating Assurance Engagement Results.

According to the IIA Standards, particularly Standard 2500 - Monitoring Progress, internal auditors are responsible for monitoring the disposition of results communicated to management. They need to assess whether management has taken appropriate action to address audit findings or has consciously accepted the risk of not taking action. The follow-up process is crucial to ensure that identified risks are managed effectively. References: = IIA's Standard 2500 - Monitoring Progress and Practice Guide on Follow-up Processes.

When an internal auditor is asked to join a project team to help design controls in a software application, the most appropriate action is to advise the project team on how to develop effective controls. This advisory role ensures that the internal auditor provides expert guidance on control design without becoming directly responsible for implementation, maintaining their independence and objectivity. This approach allows the internal auditor to contribute valuable insights while ensuring that controls are properly integrated into the application.
Reference:
IIA Standard 2120: Risk Management
IIA Practice Guide: Information Technology Controls