The service layer, the top implementation layer of the digital twin reference architecture, facilitates interaction between people or society and the digital twin.

It offers services for society, evaluates digital twin performance, and influences human satisfaction through sustainable community development, environmental management, and smart transportation. It enables feedback from users which enhances overall satisfaction and informs improvements. Targeted at policy makers, FM professionals, and end-users, the service layer provides decision-making support and interaction, ensuring the digital twin benefits public good and serves stakeholders and citizens, assessed through diverse metrics.