How to evaluate the results of doing schema?

[calmicrobio]

How do you evaluate the results or effectiveness of doing (different kinds of) schema? How do we measure this specifically? Traffic change to page? GBP overall rank change? Anything else? What results should we expect from doing various schemas or what to look out for?

 

[JoyHawkins]

@marthavanberkel is who I would ask for schema questions.