Structured data helps search engines and crawlers properly categorize different types of information on a website. There is structured data for all sorts of information from addresses to reviews to recipes. However, implementing structured data correctly can be error-prone and now Google’s Webmaster Tools has added support for debugging this type of information.
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Users can click on each content type to see any relevant errors they may have made in their implementation. They can go and test those snippets with the Structured Data Testing Tool in order to test for errors and correct them, according to what Google discovers. Once you’ve used the testing tool to recheck any pages with errors, it will be updated automatically in Webmaster Tools to reflect the corrections or the problems the pages may be having. — Google Webmaster Tools Adds Debugging Support in Structured Data Dashboard by Jennifer Slegg
