Over the years, theft of staff/customer data has been of major concern to government agencies and corporate organizations alike. This affects the confidentiality of the persons affected and the integrity of such organization. This work examined various Human Resource Management Systems models and proposed a security-based model OnibereOdunayoSecurity-4 (OOS-4). The OOS-4 HRIS Model catered for four-levels of security. This book, therefore, using an iterative software development approach to building and deploying software, a Human Resource Management System was implemented and tested....