Participant observation 14 Observation 7 Observation (Educational method) 6 Observations 6 Missing observations (Statistics) 5 Research 5 Action research 4 Astronomy 3 Mathematical statistics 3 Methodology 3 Observation skill 3 Social sciences 3 Teaching 3 Adolescent 2 Child 2 Children's rights 2 Early childhood education 2 Educational method 2 Nontherapeutic Human Experimentation 2 Observations On The Mussulmauns Of India 2 Phonetic Observations, Indian Grammarians 2 Psychology 2 Research Subjects 2 Research methodology 2 Sampling 2 Sequential analysis 2 Social Science 2 Teachers 2 Weather forecasting 2 Action Research 1