1. Introduction -- 1.1 Business Cycle Research: 21st Century Perspective -- 1.2 Recent Empirical Findings in Favor of CBC -- I.Methodology -- 2. General Considerations and Historiography -- 3. The Analysis of Cyclical Dynamics -- II. National, Supra- and International Cycles -- 4. The G7 and Eurol5 Economies: 1960 - 2000 -- 5. Mode-Locking and the Global Cycle -- III. The Sectoral Constitution of Macro-Cycles -- 6. An Aggregation Problem for Linear Models? -- 7. The Synchronization of Sectoral Cycles -- 8. A Non-Linear Synchronization Model -- 9. Conclusion -- Abbreviations -- References.