Fama and French five-factor model

As described by Eugene F. Fama and Kenneth R. French, there are five common risk factors in the return on stocks and bonds.
 * Three stock market factors: An overall market factor, and two factors related to firm size and book-to-market equity.
 * 1) Equity risk
 * 2) Value risk
 * 3) Size risk
 * Two bond market factors, related to maturity and default risks
 * 1) Term risk
 * 2) Default risk

The Fama and French 5-Factor Model is not a predictive tool, it is an explanatory tool. It shows where portfolio return came from. It’s not possible to know how large the risk premiums will be from each of the five risks in the future. Thus, the model is not predictive.