In this article we illustrate and discuss a techno-centric aspect of re-engineering realized on an existent TEL system: the Apprenticeship Electronic Booklet. Although this system has been designed with end-users following a participatory process, the first version had also been found too rigid in regard to the roles management and to the underlying academic structures. In order to improve this TEL system, two approaches of re-engineering have been conducted. The first solution focuses on an internal modification of the system functionalities and parametrization facilities. The second re-engineering work follows a Domain-Specific Modeling approach that led us to propose a graphical editor communicating with the TEL system. This external component aims to provide end-users with a more user-friendly facility to configure booklets. This second work is particularly illustrated and discussed in regard to the promising underlying re-engineering process.