The effects of Creative Problem Solving (CPS) training on creativity, cognitive type, and R&D performance were investigated with 106 R&D workers of a large government-owned manufacturing company in Taiwan. Seventy-one of them volunteered to participate in the CPS training and were divided into three groups. Each group received 12 hours of CPS training and two follow-up training sessions over a one-year long period in a time-series design. The`Circle Test of the Torrance Test of Creative Thinking', and the`Myers-Briggs Type Indicator' were administered before and after the CPS training. R&D performance averaged over the past three years before the CPS training and one year after the pretest were obtained from the company. Results showed that participant's scores on fluency and flexibility of ideas were higher after the CPS training. There was also an increase in the number of persons being classified as extrovert or feeling type of cognition. In terms of R&D performance, the participants' number of co-authored service projects increased significantly from pretest to posttest, whereas no such change was observed among those 35 R&D workers who did not participated in the CPS.

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