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[gravityform action="login" description="false" registration_link_text="Register" forgot_password_text="Forgot password" /]

Please note that we have recently switched to a new website.  Due to privacy concerns, we were not able to port over passwords.  If you have not yet logged in on the new site, you will need to do a password reset using your old username.  If you have any trouble, please contact us at office@systemdynamics.org and we would be happy to help you out.