When it comes to PPC campaigns, it is just as important to organize your keywords as it is to research and identify the best ones. Astute search engine marketers use keyword groupings: Closely related keywords organized around a theme, such as product, service, audience, or searcher intent. These groupings help determine when, and in which position, an ad will show up. http://www.youtube.com/watch?v=tAcs7qzygT4&app=desktop
The criteria and metrics can be classified according to its type and time span. Regarding the type, we can either evaluate these campaigns "Quantitatively" or "Qualitatively". Quantitative metrics may include "Sales Volume" and "Revenue Increase/Decrease". While qualitative metrics may include the enhanced "Brand awareness, image and health" as well as the "relationship with the customers".