This document discusses the history and evolution of HR technology and processes from the mainframe era to today's cloud-based solutions. It notes that HR systems have moved from standalone mainframe applications in the 1980s, to integrated ERP systems in the 1990s, to today's global cloud platforms. The document advocates adopting an "HR-as-a-Service" approach using a cloud-based digital core to power automated transactions while enabling flexible cost models and integration through standards and applications. This would assess legacy systems, enable self-service and automation at lower cost, and provide an adaptable Platform-as-a-Service model for HR delivery.