Obama, Barack, 1961- 88 Obesity 241 Obesity in children 58 Obituaries 139 Object-oriented programming (Computer science) 228 Objectivity 158 Obligations (Law) 145 Observation (Educational method) 86 Obstetrics 258 Ocampo, Satur C. 87 Occidental Mindoro 52 Occultism 113 Occupational diseases 67 Occupational mobility 60 Occupational therapy 204 Occupational training 319 Occupations 285 Ocean 135 Ocean engineering 54 Oceanography 589 OCTA Research 406 Office buildings 76 Office layout 60 Office management 193 Office practice 156 Officers 321 Official Development Assistance 66 Officials and employees 5,260 Oil industries 92 Oil spills 312 Old age 116 Old age pensions 133 Older people 1,018 Oligopolies 58 Olympics 126 Ombudspersons 85 Oncology 68 Onions 159 Online education 74 Online journalism 112 Online social networks 343 Ontology 164 Open learning 140 Open source software 94 Open spaces 57 Opening 80 Opera 160 Operas 932 Operating systems (Computers) 542 Operations research 812 Ophthalmology 133 Oplan Tokhang 73 Ople, Blas F. 130 Opposition (Political science) 83 Optical communications 93 Optical data processing 77 Optical engineering 74 Optical pattern recognition 63 Optical properties 52 Optics 158 Options (Finance) 128 Oral communication 575 Oral history 107 Oral interpretation 71 Oral tradition 146 Oratorios 97 Oratory 205 Orchestral music 419 Orchids 157 Ore deposits 51 Organ music 104 Organic compounds 186 Organic farming 245 Organic fertilizers 66 Organization 984 Organization and administration 71 Organizational behavior 1,724 Organizational change 1,583 Organizational effectiveness 739 Organizational learning 215 Organizational sociology 270 Organizations 55 Organized crime 68 Oriental literature 86 Oriental Mindoro 134 Origami 61 Origin 316 Orphans 151 Orthodontics 143 Orthography and spelling 159 Orthopedics 156 Osteoporosis 109 Otolaryngology 87 Outdoor education 56 Outdoor recreation 135 Outlines, syllabi, etc 497 Overseas Filipino Workers 1,224 Overtures 160 Oxidation 76 Oysters 62