The platform CORRECT was created within the frame of a research and development program which gathers 9 partners coming from institutional, industrial and educational background.In such a context, this program focuses on a wide range of technical challenges from the correction of OCR outputs to their improvements through a crowdsourcing approach. The project follows 3 main targets: first to promote a crowdsourcing approach, to fulfill the need for e-accessibility /digital access (for all users and for all access devices), lastly to develop innovative tools and approaches based on man-machine relationship.One of the main technical challenges was to develop tools dedicated to the production of digital transcription consistent with the original documents. The next issue at stake was the possibility led to the improvement of the digital transcriptions in order to produce new versions of these transcriptions under several formats (such as e-books format or disabled people editions dedicated to disabled people).One of the main challenges was also to recruit, mobilize and manage a great number of contributors. Reflections on such issues and challenges had been undertaken at different levels: up to what extent and how users should be involved within the project and through what kind of collaborative mechanisms; the technical requirements of platform tools (IHM and assistance/help features) and, lastly, thoughts about contents made available.