1. Introduction  
2. Observations and Stellar Parameters  
2.1. Comparison with Photometry  
2.2. NLTE Effects  
3. Determination of Ages and Distances  
4. Sample Completeness  
5. Results  
5.1. Age-[α/Fe] and Age-[Fe/H] Relations  
5.2. Abundance Gradients as a Function of Radial and Vertical Distance  
6. Summary