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- Use present tense:
+ to express general truths or facts or conclusions supported by
research results that are unlikely to change or always true.
Eg: Galileo asserted that the earth revolves the sun.

+ to refer to the article, thesis, or dissertation itself. 
Eg: Table 3 shows that the main cause of weight increase was nutrional value.

+ to discuss your findings and present your conclusion. Also use present tense
to dicuss your results and their implications.
Eg: Weight increased as the nutritional value of feed increased. These results
suggests that feeds higher in nutritional value contribute to greater weight
gain in livestock. (Use past tense to indicate what you found (weight increased),
but use present tense to suggest what the result implies.



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- Use past tense:
+ to describe your methodology and report your results.
+ to refer to the work of previous researcher.
+ to cite previous research in your writing. Whatever a previous researcher said,
did or wrote happened at some specific time.
Examples:
a) Smith (2008) reported that adult respondents in his study remembered 30 percent
more than children.
b) Previous research showed that children confuse the source of their memories
more often than adults. (The research was conducted in the past, but the finding
is now widely accepted fact.)

+ to describe a fact, law, or finding that is no longer considdered valid.

