Three studies investigated the influence of mood states on the processing of positive and negative information regarding caffeine consumption and on the impact of this information on one's mood, attitudes, and intentions. The results were consistent with the predictions of the mood-as-a-resource hypothesis: First, the induction of positive mood in high (compared with low) caffeine consumers enhanced recall of negative information about caffeine consumption. Second, processing information about caffeine consumption undermined the positive mood of high (but not low) caffeine consumers. Third, the induction of positive mood enhanced the impact of negative information about caffeine on high (compared with low) caffeine consumers' attitudes and intentions toward caffeine consumption.How does mood influence the way people process information about their personality, competence, or health? How do people use such information when they are in a good or bad mood? Past research has demonstrated that when people are processing information, mood may serve as a goal (e.g., Wegener & Petty, 1994;Zillman & Bryant, 1985) and as information (Bless, Bohner, Schwarz, & Strack, 1990;Schwarz, Bless, & Bohner, 1991). When mood serves as a goal, people tend to ignore negative information and seek positive information in a bid to eliminate a negative mood or maintain a positive mood. As information, negative moods, which signal that something is wrong or amiss, motivate individuals to process information more elaborately, whereas positive moods, which signal that everything is all right, decrease the motivation to elaborate on information-processing tasks. The present research investigates a different function of mood; namely, its use as a resource in the processing of self-relevant information. The question is whether and under what conditions positive mood facilitates processing and use of both positive and negative selfrelevant information.To address this question, we distinguish between the potential costs and benefits of self-relevant information. On the one hand, such information may help individuals assess themselves and guide their future decisions and self-improvement efforts