Hi, 
we are conducting research with couples and would like to match the data of the specific couples within lime survey. What is the easiest way to accomplish that goal?

Further, we have 3 intervention groups, and a pre - post design in two different languages (English and German). Is there a way to include all measurements under two surveys (one survey in German and one in English for all possible measurements) instead of creating 12 different surveys for each of the possible measurements (e.g. one separate survey for intervention group I, pre, German, one survey for intervention group I, post, German, one for intervention group II, pre, German, and so on) ?

Best,
Jonathan 

I assume you know the couples before they participate. Then I would use a token based survey, so every participant gets an individual link with a token, you can save the name, etc. in the token table. This way you can match their responses via the token.

Same thing as above, you can use tokens to send an individual link to the respondents. In the token table you can create custom attributes (in addition to the standard ones like name, email, etc.). In the custom attribute you can save which intervention group they belong to and if it is pre or post. Based in this attribute you can show/hide the respective questions for each case via relevance equation.

You could also create just one survey including both German and English. Within the token table you can define via language attribute which language should be shown (assuming that the language questionnaires only differ in terms of language and not question structure).