In the fifth era of Information Systems (IS) evolution (Laudon and Laudon, 2013), we can observe Information and Communication Technologies (ICT) in various professional contexts. Their constant evolution is particularly noticeable in the last few years. We experience an explosion of new tools, devices and services, as for example cloud computing and applications for Smartphones and tablet PCs. Today different organizations have to learn how to make profit of these evolutions, and how to fully take advantage of new technologies as support for their business processes.The choice of the approach to adopt is not a simple decision for organization's leaders. Design a new application? Buy an existing one, and maybe try to adapt it? The design from scratch is rarely used for Information System applications, as their complexity requires an important amount of resources for IT development. On the other hand, the implementation of existing software nearly always requires some adaptations, and leads to the signature of a development recipe.Independently of the selected approach, the implementation of new IS tools in professional context is not only the matter of ICT design. It will involve the mutual transformation of the organization by the technology and of the ICT by the organization, in a two-way process (Berg, 2001). A prior definition of the model of the actual system is a prerequisite for the study of IS introduction (Blanc, 2005) and can guide the reflection in the context of different user needs (Scandurra et al., 2008).The key aim of our research is to propose a framework for the accompaniment of organizational innovation linked with the implementation of new technological tools (ICT) within the organizational Information System. More specifically, through the concept of usage we aim to study the accompaniment of the bi-directional transformation of the organization by the new IS tool and of the IS by the organization within the constraints of real-world business settings. Our approach to the analysis of the link between the organization and the IS tools is inspired from the Task-Artefact Cycle (Carroll and Rosson, 1992; Carroll, 2014) and Activity Theory and Analysis (Engeström, 2000; Kaptelinin and Nardi, 2006; Bardram and Doryab, 2011).The objective of this paper is to present first part of our approach, concerning one direction of the transformation, where an organization proceeds to the ICT choice, evaluation and adaptation through redesign. The results presented come from experimentations realized within a home healthcare organization (HHO), willing to introduce the electronic healthcare record (EHR).< Réduire