tracking poll
noun[C]
MARKETINGukus(alsotracking study)astudyin which the samesmallgroupofpeopleareaskedthe same set ofquestionsrepeatedlyovertimetomeasurehowtheiropinions,needs, etc.change:
Thetrackingstudyrevealedthatnutritioninformationwas veryimportantto 50% ofshoppers.