a) Completion Links (Recommended)

A completion link automatically redirects participants back to the platform where they were recruited once they finish your experiment. This link ensures that the platform logs their participation as "complete," allowing them to receive their compensation. Here’s why we recommend using completion links:

Data Integrity: The automatic redirection ensures that no steps are skipped, keeping your data collection process smooth and error-free.

Simplicity: Participants don’t need to manually input any codes or perform extra steps—they’re simply redirected once the study is done.

Reduces Cheating: Only those who fully complete the study are logged, preventing fraudulent completions.

b) Completion Codes

In some cases, a participant pool might not support completion links (for example, if they don’t accept redirects). If that’s the case, you can use completion codes instead. Here, participants will see a unique code at the end of the experiment, which they will manually enter into the platform to verify their completion.

While completion codes work, they introduce an extra step for participants, which can sometimes lead to errors (e.g., participants forget to submit the code).
For simplicity and data consistency, we still recommend using completion links wherever possible, as they automate the process and reduce the likelihood of mistakes and fraud.

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