Wildblue I have searched a lot and found both tenses in a great number of published papers. Then the option is obviously yours.
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WildblueI have searched a lot and found both tenses in a great number of published papers.Then the option is obviously yours.
Wildblue"The aim of this study was to investigate. . . "The study is complete. The purpose statement was in the past. You re going to report about the completion of the purpose.
Wildblue"The aim of this study is to investigate. . . "You are writing a narrative about this study, so you cast the text into the present.