The research examines the effects of divergent and convergent creative thinking techniques on creative ideation processes. To analyze these effects an experiment is undertaken on advertising creatives, account executives, and students. Results demonstrate that divergent thinking techniques improve the idea originality of account executives, but not creatives. Alternatively, creatives produce more appropriate ideas by using convergent thinking techniques, yet account executive performance is clearly harmed by them. Few effects are seen on the student control group, who lack both knowledge of techniques and the domain. The findings suggest that creativity techniques are not a one-size-fits-all proposition but need to be tailored to the person and the situation in which they are applied. Implications for researchers and marketing managers are discussed.