Need approval of HR from a company to study Performance management system

We are a group of four MBA students from IMT Nagpur currently conducting research on performance management systems within organizations. Our aim is to gain a comprehensive understanding of appraisal systems by interviewing approximately 15 employees at various levels within a company. We believe that your organization's insights into this area would be invaluable to our research. We are particularly interested in connecting with individuals who have experience with your company's performance management processes. We assure you that all information collected during the interviews will be treated with the utmost confidentiality. If you require any additional assurances, such as a formal letter of confidentiality, we would be happy to provide one. Your cooperation in this research project is greatly appreciated. We would be delighted to schedule a call or personal message to discuss this further at your convenience. Thank you for your time and consideration.