This document discusses socio-technical systems (STS), which are systems that include both technical and social elements, such as people, processes, and technologies. It provides examples of STS, including websites and healthcare systems. It discusses the history of STS, from its origins in analyzing work systems to its modern applications. It also compares STS design to user-centered design, noting that STS takes a more holistic view. The document outlines challenges of designing STS and considerations such as balancing user, business, and technical needs. It emphasizes the importance of a systems thinking approach and involving users in design.