This work examines the effectiveness of the creativity-program Ideefix in fourth grade children. The sample used for the evaluation of the training included 87 children (45 in the training group, 42 in the waiting control group) from conventional classes. The creativity of the children was tested for three times with figural-graphic tasks using Krampens creativity test for children of preschool and school age, verbal tasks using the Alternative Uses Test and Urban and Jellens test for creative thinking. The training group completed the training between the first and the second session. The waiting group received the training between the second and the third session and therefore serves as control group. Possible long lasting training effects were assessed in the performance of the training group at the third testing session. The creativity program was intended to train figural-graphic, verbal and activity-related creativity and consisted of three-day-training sessions (one hour each day).The results show a positive training effect. Both, training and waiting group increased significantly in their figural-graphic and verbal creativity, as well as in creative thinking, after they completed the training. Furthermore, the fluency and flexibility of creative performance in figural-graphic tasks and the performance in creative thinking of the training group remained stable between the second and the third measurement session. The fluency of the training group in verbal tasks even increased significantly between the second and third testing session. This indicates some long lasting training effects of the creativity program Ideefix.