Human resource accounting is the process of identifying, measuring, and reporting on the value of employees to a company. It aims to overcome limitations of traditional financial accounting by helping management make better decisions regarding human resource efficiency and planning. Models for valuing human resources include historical cost, replacement cost, and opportunity cost methods for accounting, as well as Hermanson, Lev-Schwartz, Flamholtz, and other models for determining the value of employees. Challenges include determining the appropriate value and accounting methodology for human capital. Accurately valuing employees can provide benefits like assessing return on investment in training and improving personnel policies.