1. Introduction
2. Architecture of grey forecasting models
3. Mechanism and reduction of grey forecasting models
4. Continuous-time grey endogenous forecasting models
5. Discrete-time grey endogenous forecasting models
6. Continuous-time grey exogenous forecasting models
7. Discrete-time grey exogenous forecasting models
8. Nonlinear grey forecasting models
9. Grey number-oriented forecasting models
10. Comments and future thinking.