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Testing of biometric systems requires the consideration of aspects beyond technical and statistical parameters. Especially for testing biometric techniques based on behavior, human factors like intention and forgery strength need to be considered. In this paper, a test tool to support skilled forgeries by test subjects is presented for handwriting verification systems. The software tool has been implemented on two computer platforms and is based on a three level forgery quality model. First experimental results are presented, which indicate that by applying the presented system in attack tests, forgeries of gradual quality can be obtained from test persons.