Mr Mitra, First of all let me tell you the article you have written is very informative and interesting. But, I do have a question. What I believe is when we talk about big data, and collection of data from social media web site etc. But, don't you think this can lead to erroneous data collection? The sample size would be really small and that too will vary from survey to survey or among social media websites. Moreover, it is being said that Customer do not know many of the times what they want. So, again collecting data based on it may lead to a decision which can be said as data driven, but won't that lead to a decision which is right partially? Regards, Angshuman Sarkar