Which strategy focuses on verifying past employment references?

The strategy that focuses on verifying past employment references is background investigation. This process involves systematically gathering information about a candidate’s previous work history, education, and any other relevant details that can validate their credentials and experience. Background investigations are crucial in the hiring process as they help employers ensure that the information provided by a candidate is accurate and reliable. Verifying past employment references not only builds trust but also provides insights into the candidate's abilities and work ethic, which are critical in making informed hiring decisions.

In contrast, performance reviews are assessments of an employee's work performance conducted typically by their current employer, not a verification of past employment. Self-assessment involves candidates evaluating their own skills and competencies, which does not independently verify employment history. Skills testing assesses specific abilities relevant to the job but does not involve checking past employment references. Thus, background investigation is the most appropriate strategy for this purpose.