Research is always helpful to get a conclusion about something .but for doing research it's always advisable to collect data from larger level of society.because if data is collected from the larger part of society then it is seems to be accurate.there are two many methods to getting research.literature search is one of the method , personal interview,face to face questionnaire, telephone survey,mail survey,email survey and internet survey.
Hence when data is collected from larger level then cost of collecting data is a biggest problem.data collection is time consuming process.
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