You were not involved in the original data collection process. This means you have no control over:
Measurement Instruments: The exact wording of survey questions, the design of experimental stimuli, or the observation protocols.
Sampling Methodology: How participants were selected, which can impact generalizability.
Contextual Factors: Nuances of the collection environment that might have influenced responses.
Data Cleaning Decisions: How the original collectors handled outliers, missing data, or errors.