Preface; 1. Model ingredients: stellar evolution models; 2. Model ingredients: stellar spectral libraries; 3. Initial mass function; 4. Stellar population models; 5. Stellar populations in the Milky Way; 6. Resolved stellar populations in the Local Group; 7. Stellar populations in early-type galaxies; 8. Extragalactic globular cluster systems; 9. Stellar populations in late-type galaxies; 10. Stellar populations at higher redshifts; 11. New observing facilities; Author index.