Unique ID linking study parts, anonymous, contact list triggers

Question

Hello,I would like to link several study parts using a unique identifier and was wondering which option would be best depending on the study design. It will be a longitudinal study with two treatment conditions and one control group. In total having 4 waves. in t0: all participants go through the same survey and receive an official invitation to participate in the study. in t1: participants will be randomly assigned to either the control group, treatment 1 or treatment 2 groupin t2: participants need to be directed to one specific version of a follow up questionnaire,depending on what they have seen in t1.in t3: participants again need to be directed to one specific version of a follow up questionnaire.a) Each participant should have a unique ID which allows me  to link the different data sets corresponding to each participant. b) The questionnaire should be anonymous.c) How can I handle to direct participants to a specific questionnaire depending on the experimental condition in which they participated earlier (e.g. in t1 or t2)?Thanks!

TomG · Accepted Answer

In all your surveys (t0-t3) click Anonymize in survey options.In t0, create a unique id using a webservice or JavaScript and save it as an embedded data field. For the people you will invite, redirect to another survey and pass the unique id as a parameter. In that survey ask for their email (and any other PII you need to save such as name). Use a contact trigger to save their info to a contact list, saving the unique id as the ExternalDataReference. In t1, use a survey flow randomizer to set an embedded data variable as control, treatment 1, or treatment 2. Then branch using the 'group' variable as needed. Use a contact list trigger to update the contact list with the 'group' variable.In t2/t3, use the 'group' variable to branch as needed.

TomG · Answer

Item (b) isn't clear. Should the data for all the surveys (t0-t3) be anonymized (so there is no PII in the response data) or will an anonymous link be used for t0?

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