1. Introduction  
2. Gaia-ESO Observations and Data  
3. Sample Clusters  
3.1. Cluster Properties  
3.2. Target Selection  
3.3. Completeness  
4. Membership Analysis  
4.1. Spectroscopic Candidates  
4.2. Kinematic Analysis  
4.3. Velocity Dispersion from TGAS  
4.4. Stellar Mass and Radii  
5. Discussion  
5.1. GES Versus TGAS Velocity Dispersion  
6. Summary