Use the Add Label action to label incoming messages handled by your workflow. Whereas sorting contacts into groups allows you to segment contacts based on their responses, labeling incoming messages allows you to isolate responses to a specific question. Message labels can be viewed - and also created - in the messages tab:
How it Works
Let's say you're running a therapy adherence study in which participants are asked to indicate how they're feeling each day - healthy or ill:
Adding an Add Label action after the "Wait for Condition" RuleSet pictured above allows you to filter responses that pass through a particular category. In the example pictured above, we've placed an Add Label action in a branch that stems from the "Ill" category. Accordingly, only responses that are registered as "Ill" will be labeled. You can then view these messages by navigating to the messages tab and click the "Feeling Ill" label.
Adding a Label
Adding a label is as simple as creating an ActionSet, or adding an ActionSet to an existing ActionSet. You may choose an existing label, or create a new one via the Add Label dialogue: