This book contains the three scientific essays that constitute the PhD dissertation of Alexander Lieder: [1] A Dynamic Programming Approach for the Aircraft Landing Problem with Aircraft Classes (also published in: European Journal of Operational Research) [2] Scheduling Aircraft Take-Offs and Landings on Heterogeneous and Interdependent Runways (also published in: Transportation Research Part E: Logistics and Transportation Review) [3] Task Scheduling in Long-Term Care Facilities: A Client-Centered approach (also published in: Operations Research for Health Care)