${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}is\text{a}\text{s}\text{y}\text{s}\text{t}\text{e}\text{m}\text{f}\text{o}\text{r}\text{g}\text{a}\text{t}\text{h}\text{e}\text{r}\text{i}\text{n}\text{g}\text{i}\text{n}\text{f}\text{o}\text{r}\text{m}\text{a}\text{t}\text{i}\text{o}\text{n}\text{f}\text{r}\text{o}\text{m}\text{r}\text{e}\text{s}\text{p}\text{o}\text{n}\text{d}\text{e}\text{n}\text{t}\text{s}by\text{c}\text{o}\text{n}\text{t}\text{i}\text{n}\text{u}\text{o}\text{u}\text{s}\text{l}\text{y}\text{m}\text{o}\text{n}\text{i}\text{t}\text{o}\text{r}\text{i}\text{n}\text{g}\text{t}\text{h}\text{e}advertising,\text{p}\text{r}\text{o}\text{m}\text{o}\text{t}\text{i}\text{o}\text{n}\text{,}\text{a}\text{n}\text{d}\text{p}\text{r}\text{i}\text{c}\text{i}\text{n}\text{g}\text{t}\text{h}\text{e}\text{y}\text{a}\text{r}\text{e}\text{e}\text{x}\text{p}\text{o}\text{s}\text{e}\text{d}to\text{a}\text{n}\text{d}\text{t}\text{h}\text{e}\text{t}\text{h}\text{i}\text{n}\text{g}\text{s}\text{t}\text{h}\text{e}\text{y}\text{b}\text{u}\text{y}\text{.}}$

${?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{i}s$ a system for gathering information from respondents $by$ continuously monitoring the advertising, promotion, and pricing they are exposed $to$ and the things they buy.

Online research communities

$An$ online focus group

Scanner$-$based research

A web survey system