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social group work group work skills group work principles sampling adjourning social case work mary richmond 4p's process of social case work principles characteristics objectives definitions research process selection of research problem review literature making hypothesis preparing the research design data collection performing storming norming forming group development stages settlement house movement elizabethan poor law charity organisation history of social work self help groups jlg socialisation groups t groups treatment groups types of groups diagnostic study evaluation study action research experimental research analytical study historical research survey planning for a research study research design population or universe sample sampling methods census probability sampling non probability sampling groups group work group work process data analysis hypothesis testing generalization and interpretat conclusion preparation of report sources of problems process of identification criteria of selection formulation process concepts hypotheses variables pure research applied research exploratory research descriptive study process