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1800´s
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accumulated through the syudy of phenomena that can be phisically sensed
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"the structure of scientific revolutions"
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research is a method that can be separated from the word view
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"mixed paradigms"
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His book: "Research Design"
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As a conclusion we can say that the qualitative and quantitative research are complementative, one is based on observing and the other is based on experiences and the experientations, both to get to a good conclusion