Methods for the evaluation of stimuli such as broadcast commercials intended to promote purchases by shoppers are disclosed. The methods quantify the effectiveness of controlled variables of stimuli and of inducements associated therewith. The immediate impact and degree of erosion of the impact of stimuli on families and on individual household members are measured. Inducements can take the form of printouts, such as monetary coupons, dispensed in homes of broadcast audience members who have responded to a task. The system and method for evaluating responses to broadcast or telephone programs, such as television programs, includes an instructional signal, such as a signal modulated onto a signal transmitted concurrently with the television program, or time-multiplexed therewith. At each of a plurality of remote receiving stations, one or more members of an audience has the opportunity to respond to a situation presented in the program by entering a response or a selection on a keyboard. The system includes at each remote receiving station a memory responsive to the instructional signal for storing acceptable responses, and a comparison circuit for comparing responses entered at the keyboard with those stored in the memory. Also provided is electronic circuitry for scoring the responses in accordance with commands from the instructional signal, and a recording device for providing a permanent record. A prize-winning respondent can select a product from a listing and apply the value of a prize to the purchase price of the selected product.