The document summarizes Seoul's Clean Construction System which was introduced to improve construction project efficiency and transparency. It has four components: One-PMIS, an online project management system; Allimi, a public information disclosure system; an automated subcontractor payment system; and an electronic human resources system. One-PMIS allows real-time monitoring of construction materials, workers, and processes. Allimi is a public portal providing contract details, photos, stakeholders, and allowing citizen participation. Seoul made One-PMIS use mandatory for large public projects and provides training and support to promote its institutionalization.