Sales promotion techniques such as product sampling and couponing are
widely believed to encourage trial among non-users, but few published
studies have verified this belief empirically. This paper reports the
results of a study that examined the effectiveness of mail-drop produc
t samples and coupons as means of promoting trial behaviour among non-
users of three products. The results indicated that samples and coupon
s encourage more trial when delivered in combination than when deliver
ed separately, and that coupons delivered alone are an ineffective mea
ns of generating trial. The study recommends that trial rates for prod
uct sampling be based on the number of samples actually delivered and
incorporate an estimate of delayed trial, and that current product use
rs be excluded from the analysis.