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Abstract
This study aimed to understand the processes of interpretation of, and responses to,
the task of completing a theory of planned behaviour (TPB) questionnaire. Forty-five
adults verbalized their thoughts while completing a full TPB questionnaire on walking
behaviour. On average, participants' verbalizations indicated around 16 problems with
the 52 questions. Further, problems as identified from verbalizations were associated
with increased endorsement of the middle option on the questionnaire. Normative and
intention questions were found to be particularly problematic. The current standardized
method to develop TPB measures systematically yields problematic questions, as indicated
by both talk and questionnaire responses.