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As mentioned previously, qualitative monitoring tools are the tools you can use to measure the sentiment people have about your product or service. As good as Google Analytics is, it can only measure quantitative data, not qualitative data.
The great thing about qualitative information is that it gives you insights into the preferences of the people who are talking about your product or service. In other words, it provides a snapshot of how people feel about your brand.
Why is that important? Because people buy products for emotional reasons, and then rationalize their purchase with logic. They purchase items based on a gut feeling or a relationship with the brand, and then explain why they bought the product in logical, rational terms.