Acknowledgement A work of this kind is rarely the effort of one person alone, and this thesis makes no exception to this rule. Throughout the various phases of my research, from my integration in the Dual-T research project, to the implementation of the learning activities and the redaction of my findings, I have been guided, accompanied and assisted by a number of different people, each one with his/her own style and competences. It is now time for me to thank these people for the priceless

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... port I have received from them. In the first place, I would like to thank Prof. Mireille Bétrancourt, the director of this thesis, for the way she guided me throughout this experience, never "directing" but always accompanying me, pointing me towards new goals, sharing with me her ideas, and often redirecting my efforts. These allowed me to feel responsible for this project, while, at the same time, never alone in its implementation. Her style of guidance made an enormous difference for me, and I will always be grateful for the confidence she gave me when she chose me for this PhD and afterwards worked with me through it.