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kurt lewin the structure of personality change management process lewin’s equation research ethics model of marketing process marketing and advertising marketing process characteristics of research hypothesis research types of hypothesis hypothesis purchase and post purchase behaviour models levels of decision making factors influencing consumers decisions consumer decision making process consumer psychology consumer behaviour ethological theory social cognitive theory ecological contextual theory theories of development developmental psychology life span development social psychology factors that promote resilience factors related to resilience resilience resolving grievances grievances grievance redressal procedure steps types steps in grievances process handling grievances reasons effects forms development of personality and types of conflicts types of conflicts development of personality harry f harlow's research and experiments steps in role playing advantages and disadvantages of role playing types of education styles role play in training ethics in collection of data ethics in research