For a few years, Electronic Laboratories (ELabs: computer-aided local laboratories as much as distant and virtual ones) have been growing in the E-Learning panorama. Meanwhile, in major E-Learning activities, learning scenarios are nowadays written in a standard way (SCORM, IMS-LD) to be used by standard Learning Management Systems. The use of such scenarios in ELab trainings is appearing just now. However such scenarios are dedicated to one specifi ELab and cannot be easily used for other similar ELabs. Since 2002, we work on the integration of learning scenarios into ELab platforms to help to re-use learning scenarios corresponding to similar apparatuses. Paper describing the global corresponding life-cycle have already been published. This paper introduces a tool which intervenes in the first step of this life-cycle: the learning scenario design process. It should help authors to design "generic" ELab learning scenarios, available for functionally compliant ELabs. This tool also aims at pre-testing such learning scenarios on a virtual apparatus to check scenario-apparatus communication.