1. Introduction | 2. Feature Selection Process | 2.1. Search algorithms | 2.2. Filter methods | 2.3. Wrapper methods | 2.4. Feature Selection process example | 2.4.1. Search + Wrapper | 2.4.2. Search + Filter | 2.4.3. Individual evaluation of features | 3. Direct Feature Selection Process | 3.1. Direct search algorithms | 3.2. Direct Feature Selection process example | 4. Hybrid Feature Selection Process | 4.1. Hybrid search algorithms | 4.2. Hybrid Feature Selection process example