Closed-Loop Marketing is marketing that relies on data and trends that were gathered through following a visitors journey through the site. By using this data, marketers are better able to determine where the most traffic is being received and shift the strategy accordingly. If done correctly, you will be able to see how successful your marketing investment is in bringing in new business prospects.
An inbound marketing strategy enables a business to engage in closed-loop marketing.
If your goal is figuring out how your inbound marketing drives quantifiable business growth, you might want to take a look at this one. The practice means being able to execute and tie in marketing efforts to bottom-line impact.