| 1. | 3PL |
| 2. | Accounting |
| 3. | Agent Systems |
| 4. | Analytic Hierarchy Process |
| 5. | Applications, Agriculture and Forestry |
| 6. | Applications, Airline |
| 7. | Applications, Arts |
| 8. | Applications, Climate Change |
| 9. | Applications, Computer Science |
| 10. | Applications, Electronic Services |
| 11. | Applications, Energy |
| 12. | Applications, Mining |
| 13. | Applications, Sports |
| 14. | Applications, Water Management |
| 15. | Applied Probability |
| 16. | Approximation Algorithms |
| 17. | Artificial Intelligence |
| 18. | Auctions |
| 19. | Automated Algorithm Selection/Construction/Tuning |
| 20. | Autonomous Systems |
| 21. | Behavioural Operational Research |
| 22. | Big Data |
| 23. | Bilevel programming |
| 24. | Climate and Disaster Risk Management |
| 25. | Combinatorial Optimization |
| 26. | Complex Societal Problems |
| 27. | Complexity and Approximation |
| 28. | Computational Biology |
| 29. | Computational Statistics |
| 30. | Conic Optimization |
| 31. | Constraint Programming |
| 32. | Continuous Education in OR |
| 33. | Control Theory |
| 34. | Crop Allocation |
| 35. | Cutting and Packing |
| 36. | Data Analyics for Sports |
| 37. | Data Decision Driving |
| 38. | Data Envelopment Analysis |
| 39. | Data Mining |
| 40. | Data Science |
| 41. | Data Space |
| 42. | DEA |
| 43. | Decision Support Systems |
| 44. | Decision Theory and Analysis |
| 45. | Decomposition Techniques |
| 46. | Deep Learning |
| 47. | Developing Countries |
| 48. | Development |
| 49. | Dial-a-ride |
| 50. | Digitalisation and Sensoring |
| 51. | Disaster and Crisis Management |
| 52. | Distributed Computing |
| 53. | Drayage and Hinterland Transport |
| 54. | Dynamic Systems |
| 55. | E-Commerce |
| 56. | Economic Modeling |
| 57. | Education |
| 58. | Educational activities for OR-Analytics |
| 59. | Electricity Markets |
| 60. | Emerging applications of OR |
| 61. | Enterprise Resource Planning |
| 62. | Environmental Management |
| 63. | Ethics and Governance |
| 64. | Ethics and OR |
| 65. | European Research Council |
| 66. | Exact Methods |
| 67. | Expansion Planning with Renewables |
| 68. | Expert Systems and Neural Networks |
| 69. | Facilities Planning and Design |
| 70. | Finance |
| 71. | Financial and Management Accounting |
| 72. | First-order Methods |
| 73. | Flexible Manufacturing Systems |
| 74. | Food Distribution |
| 75. | Food Logistics |
| 76. | Food Loss and Waste |
| 77. | Food Security |
| 78. | Food Waste |
| 79. | Forecasting |
| 80. | Freight Transportation |
| 81. | Fuzzy Sets and Systems |
| 82. | Game Theory |
| 83. | Genetic Algorithms |
| 84. | Global challenges |
| 85. | Graph Theory |
| 86. | Graphs |
| 87. | GRASP |
| 88. | Harvest Planning |
| 89. | Health Care |
| 90. | Health, Nutrition, Sanitation and Water |
| 91. | Healthcare Analytics |
| 92. | Healthcare Logistics |
| 93. | Healthcare Service Delivery |
| 94. | History of OR |
| 95. | Hub and Market Location |
| 96. | Human Resources Management |
| 97. | Information Systems |
| 98. | Infrastructure & Smart Cities |
| 99. | Intelligent Transportation Systems |
| 100. | Interactive Multiobjective Optimization |
| 101. | International Business and Collaboration |
| 102. | Inventory Management |
| 103. | Knowledge Engineering and Management |
| 104. | Knowledge, Knowledge Applications and Analytics |
| 105. | Knowledge, Technology, and Innovation Management |
| 106. | Landscape Analysis |
| 107. | Last-Mile Delivery |
| 108. | Life Sciences |
| 109. | Local Infrastructure |
| 110. | Location and Routing |
| 111. | Location Problems |
| 112. | Logistics |
| 113. | Lot Sizing |
| 114. | Machine Learning |
| 115. | Maritime Logistics |
| 116. | Marketing |
| 117. | Matching with Preferences |
| 118. | Mathematical Economics |
| 119. | Matheuristics |
| 120. | Medical Systems |
| 121. | Metaheuristics |
| 122. | Migration |
| 123. | Military Operations Research |
| 124. | Mixed Integer Programming |
| 125. | Modeling Systems and Languages |
| 126. | Multi-Criteria Decision Analysis |
| 127. | Multiple Attribute Utility Theory |
| 128. | Natural Resources |
| 129. | Network Design |
| 130. | Network Flows |
| 131. | Network Interdiction |
| 132. | New OR Study Programs |
| 133. | Nonconvex Global Optimization |
| 134. | Open Source Software |
| 135. | Operations Management |
| 136. | Optimal Control |
| 137. | Optimization Models and Methods |
| 138. | Optimization Over the Efficient Set |
| 139. | OR and Common Good |
| 140. | OR Education and Gamification |
| 141. | OR Education in specific fields |
| 142. | OR Education Link to Development |
| 143. | OR in Education |
| 144. | OR in Military, Defense, and International Security |
| 145. | OR in the Public Sector |
| 146. | OR Research Funding |
| 147. | Outranking Methods |
| 148. | Pareto-Optimal Frontier |
| 149. | Performance Measurement |
| 150. | Portfolio Optimization |
| 151. | Power System Operation |
| 152. | Power System Planning |
| 153. | Pricing |
| 154. | Probability |
| 155. | Problem Structuring Methods |
| 156. | Production |
| 157. | Production Management |
| 158. | Programming, Dynamic |
| 159. | Programming, Integer |
| 160. | Programming, Linear |
| 161. | Programming, Mathematical |
| 162. | Programming, Nonlinear |
| 163. | Programming, Quadratic |
| 164. | Programming, Semi-Infinite |
| 165. | Programming, Semidefinite |
| 166. | Programming, Sequential Quadratic |
| 167. | Project Management and Scheduling |
| 168. | Public Transport and Traffic |
| 169. | Quality Control |
| 170. | Quality Management |
| 171. | Quantum Computing |
| 172. | Queueing Systems |
| 173. | Relaxations |
| 174. | Reliability |
| 175. | Revenue Management and Pricing |
| 176. | Reverse Logistics |
| 177. | Risk Analysis and Management |
| 178. | Robust optimization |
| 179. | Rostering |
| 180. | Routing |
| 181. | Scheduling |
| 182. | Seaside Planning |
| 183. | Service Science |
| 184. | Shared Mobility |
| 185. | Simulation |
| 186. | Smart Agriculture |
| 187. | Societal Complexity |
| 188. | Soft OR |
| 189. | Software Engineering |
| 190. | Software for OR |
| 191. | Solar Power |
| 192. | Sports Tournaments |
| 193. | Stochastic Frontier Analysis |
| 194. | Stochastic Games and Control |
| 195. | Stochastic Models |
| 196. | Stochastic Optimization |
| 197. | Stochastic Processes |
| 198. | Strategic Planning and Management |
| 199. | Supply Chain Management |
| 200. | Sustainable Development |
| 201. | Sustainable Transportation |
| 202. | System Dynamics |
| 203. | Tabu Search |
| 204. | Telecommunications |
| 205. | Territory Design |
| 206. | Timetabling |
| 207. | Timetabling in Sports |
| 208. | Traffic |
| 209. | Transportation |
| 210. | Variational Problems |
| 211. | VNS |
| 212. | VRP |
| 213. | Warehouse Design, Planning, and Control |
| 214. | Yard Management |