Participant observation Action research 4 Research 3 Adolescent 2 Child 2 Children's rights 2 Nontherapeutic Human Experimentation 2 Research Subjects 2 Research methodology 2 Social Science 2 Social sciences 2 Audiences 1 Content analysis 1 Evaluation research 1 Field Work 1 Health 1 Industrial management--Research 1 Management--Research 1 Research Methodology 1 Sampling 1 Scaling 1 Social research 1 Social science-Research 1 Sociometry 1 Special events 1 Spectators 1