Assistive Technology (AT) aims at compensating for motor, sensory or cognitive functional limitations of its users. One of the reasons AT is hard to design and turn into a product is the variability of kinds and degrees of disabilities and individual characteristics among users (physical, psychological, cultural and environmental). This variability can be addressed by means of configurations. This work takes as a starting point the premise that the ability for the end-user to adapt AT may have the potential to improve user s experience and the quality of the products. However, before engaging in such endeavor we must answer questions like: what is configuration in the AT domain? What does AT mean to users (and stakeholders)? What could, should or should not be configured and how? In this work, we conducted a case study mixing ethnography and actionresearch with a single tetraplegic participant who came to our lab seeking for technology that could help him in his daily life. First, we interviewed him and observed his daily needs and activities and then we developed an AT platform prototype that controls some devices to be operated simultaneously by gesture and voice interaction in his smart home. Throughout two action-research cycles, we investigated interaction and technological issues regarding our prototype configuration and use. Based on our findings, we propose a set of dimensions and a collaborative framework for AT configuration. Our main contribution is to propose a conceptual structure for organizing the AT configuration problem space to support the design of similar technologies.