Make critical comments as you read and this will help you develop critical analysis. For paper copies these could take the form of post-it notes and for electronic documents you could use margin notes. Critical comments on a journal article could focus on:
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whether the research design is appropriate to answer the research questions
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whether the sample is appropriate in relation to the research design and the extent to which the results can be generalised
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evidence of author bias
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your evaluation on the validity / reliability of the findings
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the rigour of the data analysis
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how the findings compare with those of other researchers in this area
(Adapted from O’Leary, 2010 and Punch, 2009)