1. Progress in the Synthesis of 4,5,6,7-Tetrahydroindoles2. Heterocycles in Polymers3. Three-Membered Ring Systems4. Four-Membered Ring Systems5.1 Five-Membered Ring Systems: Thiophenes and Selenium/Tellurium Analogs and Benzo Analogs5.2 Five-Membered Ring Systems: Pyrroles and Benzo Analogs5.3 Five-Membered Ring Systems: Furans and Benzofurans5.4 Five Membered Ring Systems: With More than One N Atom5.5 Five Membered Ring Systems: With N and S Atoms5.6 Five-Membered Ring Systems: With O & S (Se, Te) Atoms5.7 Five-Membered Ring Systems: With O & N Atoms6.1 Six-membered ring systems: Pyridines and Benzo Derivatives6.2 Six-Membered Ring Systems: Diazines and Benzo Derivatives6.3 Triazines, Tetrazines and Fused Ring Polyaza Systems6.4 Six-Membered Ring Systems: With O and/or S Atoms7. Seven-Membered Rings8 . Eight-Membered and Larger Rings