Human Resource Accounting (HRA) involves identifying, measuring, and communicating data about human resources, focusing on costs related to recruitment, training, and their economic contributions to profitability. Methods of HRA include monetary approaches like historical cost, replacement cost, and opportunity cost, as well as non-monetary models like Flamholz's stochastic model and Hermanson's model. Additionally, psychological contracts define the relationship between employers and employees, encompassing mutual expectations and can be categorized into transactional and relational contracts.