Herzberg developed a two-factor theory that distinguishes dissatisfiers (factors that cause dissatisfaction) from satisfiers (factors that cause dissatisfaction). The absence of dissatisfiers is not enough to motivate a purchase; satisfiers must be present. For example, a computer that does not come with a warranty would be a dissatisfier. Yet the presence of a product warranty would not act as a satisfier or motivator of a purchase, because it is not a source of intrinsic satisfaction. Ease of use would be a satisfier.