This draft Recommendation describes a trust index model for ICT infrastructures and services. In order to provide a commonly applicable way for evaluating trust that covers different characteristics, trust index is a key concept for trust provisioning by considering trust value chain in ICT environment. Particularly, trust index, which can evaluate and quantify trust of stakeholders, is a comprehensive accumulation of trust indicators. This draft Recommendation identifies trust indicators that represent fundamental criteria for evaluating trust of entities in ICT environments. To represent characteristics of trust, trust indicators are categorized into two parts: objective trust indicators and subjective trust indicators. A list of trust indicators and an application of trust index are introduced.