Each lead generation technique usually has a tradeoff between quality and quantity. For example, a form on the company website that visitors can fill in to request a call back will generate high-quality leads – these visitors are very likely to buy since they're interested enough to want to hear more – but probably won't generate a lot of leads. On the other hand, a lead list that's based on a newsletter subscription list from another company may generate a lot of leads, but they won't be nearly as interested or qualified.
Online surveys: Consumers are asked to complete a survey, including their demographic information and product and lifestyle interests. This information is used as a sales lead for advertisers, who purchase the consumer's information if provided. The consumer may 'opt-in' to receive correspondence from the advertiser and is therefore considered a qualified lead.