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docs/Power features/Unipark (EFS / Tivian)
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Unipark (EFS / Tivian).

Declare URL parameters in the project, pass them as a, b, c…, and redirect from the Final Page.

1 · Pass the Samply IDs into the survey

EFS reads incoming keys a, b, c… positionally into the system variables p_0001, p_0002, p_0003. You declare how many under Project Properties → Survey Options → User-defined Variables.

  1. In the project, open Project Properties (Projekteigenschaften) → Survey Options (Umfrageeinstellungen) → the "User-defined Variables" (Benutzerdefinierte Variablen) tab.
  2. Set "Number of URL parameters" (Anzahl der URL-Parameter) to the count you need; EFS creates p_0001, p_0002, p_0003 in order.
  3. Build the start link with EFS's reserved single-letter keys in that same order: ?a=%SAMPLY_ID%&b=%PARTICIPANT_CODE%&c=%MESSAGE_ID% (a→p_0001, b→p_0002, c→p_0003). Do NOT pass ?p_0001=…
  4. Check the data export / codebook: the p_0001–p_0003 columns must contain the passed values.
Example start link
https://<survey-host>/uc/<project>/?a=%SAMPLY_ID%&b=%PARTICIPANT_CODE%&c=%MESSAGE_ID%

2 · Register completion

Final Page → Properties → "Destination URL of external survey", embedding the wildcard #p_0003# for the message id.

  1. In the Questionnaire Editor open the Final Page → Properties.
  2. Set the destination URL to: https://samply.uni-konstanz.de/studies/<study-slug>/done/#p_0003# (use whichever p_000n holds %MESSAGE_ID%).
  3. UNCHECK "Automatically add ospe.php3 to URL" and "Add return ticket" (both ticked by default) so EFS sends the participant to the unmodified Samply URL.
  4. Save and run a test completion; confirm #p_0003# resolves to the real 15-char message id.
Example completion redirect
https://samply.uni-konstanz.de/studies/<study-slug>/done/#p_0003#

Reserved parameters & gotchas

Incoming keys must be the reserved single letters a, b, c… (NOT p_0001). Mapping is positional: a→p_0001, b→p_0002, c→p_0003 — a wrong order silently stores values in the wrong column. EFS also reserves lfdn, code, c, tester, language.

Things to watch out for

  • EFS UI labels vary by version/locale and the official docs are partly login-gated, so confidence on exact English wording is medium — verify against your instance with a live test before fielding.
  • A simple outbound redirect needs no special add-on; the ospe.php3 / return-ticket options are only for returning to another EFS/Questback survey.

Sources

These steps were checked against the platform's documentation, but some UI labels vary by version — verify against your instance with a test run before fielding.