The most appropriate match between a potential temporary guest auditor candidate and an upcoming audit assignment is a manager of social responsibility who has a nursing background to participate in a health and safety audit for the corporate office and plant facilities. This candidate's background in nursing and current role related to social responsibility aligns well with the focus of a health and safety audit, leveraging relevant experience and knowledge. References: Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)

In responding to a request from senior management for the internal audit activity to review and amend policies when auditing the purchasing department, the chief audit executive would most likely give primary consideration to maintaining internal audit independence. This request potentially places the internal audit activity into a management role, which could impair its independence and the ability to perform unbiased audits in the future. According to IIA standards, internal auditors should avoid taking on operational responsibilities to preserve their independence.References: IIA Standards on independence and objectivity.

The scenario describes the internal audit team providing both assurance and consulting services. Initially, the internal audit team was engaged in an assurance activity, verifying the effectiveness of controls through standard audit procedures. However, upon discovering a knowledge gap among employees, the team extended their role to include consulting services by conducting training sessions. This mix of both assurance and consulting in the same engagement characterizes what are commonly referred to as blended services.References: Institute of Internal Auditors (IIA) - International Standards for the Professional Practice of Internal Auditing

When deciding whether to rely on the work of internal auditors, external auditors often assess the objectivity of the internal audit activity. Objectivity assures that audits are performed impartially and without bias, which enhances the credibility of the audit work. This assessment is crucial for determining the reliability of the internal audit function's work for external audit purposes.References: IIA Standard 1220: Objectivity, and external auditing standards regarding the use of internal auditors' work.

Expense reimbursement fraud typically involves the theft of assets through the submission of false or inflated expense reports, such as fictitious mileage, travel logs, or meal charges. This type of fraud is categorized under the broader concept of asset misappropriation, where employees use their position to steal from the organization through deceitful acts involving expense claims.References: IIA Guidance on Types of Fraud