Is it allowed to not take all variables from a theory?

Tiara Annisa Adhi Moulidhanty @Tiara-Moulidhanty

20 March 2024 0 7K Report

I am currently working on my thesis research on purchase intention. My reference article is Brazilian consumer perceptions towards second-hand clothes regarding Covid-19 by Amaral & Spers (2022), which seems to adapt the Theory of Planned Behavior without including the variables of attitudes, subjective norms, and perceived behavioral control. If it is allowed, what can be the justification?

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