Here are the contents of the current version:
Part I: 

1. 
What is a locally symmetric space? 
2. 
Geometric meaning of Rrank and Qrank 
3. 
Brief Summary 
Part II: 
Fundamentals 
4. 
Basic Properties of Lattices 
5. 
What is an Arithmetic Group? 
6. 
Examples of Arithmetic Groups 
7. 
SL(n,Z) is a Lattics in SL(n,R) 
Part III: 
Important Concepts 
8. 
Real Rank 
9. 
Qrank 
10. 
QuasiIsometries 
11. 
Unitary Representations 
12. 
Amenable Groups 
13. 
Kazhdan's Property (T) 
14. 
Ergodic Theory 
Part IV: 
Major Results 
15. 
Mostow Rigidity Theorem 
16. 
Margulis Superrigidity Theorem 
17. 
Normal Subgroups of Γ 
18. 
Arithmetic Subgroups of Classical Groups 
19. 
Construction of a Coarse Fundamental Domain 
20. 
Ratner's Theorems on Unipotent Flows 
Appendixes  
I. 
Basic Facts about Semisimple Lie Groups 
II. 
Assumed Background 
III. 
A Quick Look at SArithmetic Groups 