Arguing on the computer was used as a method to promote development of face-to-face argumentation skills in middle schoolers. In the study presented, sixth graders engaged in electronic dialogues with peers on a controversial topic and in some reflective activities based on transcriptions of the dialogues. Although participants initially exhibited limited ability in arguing both face-to-face and on the computer, by the end of the intervention, they exhibited significant advances in both discussion modes. The gains of practice in the electronic mode--increased levels of counterarguments and rebuttals--successfully transferred to the face-to-face mode. This suggests a generality in developing argument skills. (Contains 8 figures, 3 footnotes, and 4 tables.)