Agencies offering search engine optimization, or SEO, services abound, and choosing one of them to take on a big marketing campaign is a challenge. Clients of PGI Marketing are always satisfied with the work that is performed by the firm. The marketers at PGI Marketing use a lot of data in their approach to SEO. They believe that measurable results can only be achieved if the starting point is known before the work begins. They perform a comparative site analysis between the site of their client and the sites of competing companies. With the data they gather, they are able to determine which are the trending key phrases used by consumers who get to one of those sites. PGI Marketing also checks out the initial SERPs for those key phrases. After the SEO campaign by PGI Marketing goes live, the firm's developers continuously monitor the results and make necessary updates.