Through European countries the dependency ratio of elders and people with disability will rise in the next years. To avoid a degradation of the life quality of dependant persons, they may be maintained in their home. To ensure people safety and avoid isolation problems, some mechanisms are needed. We propose a new method, the X-development method, to guide generic product design from end-to-end. In this paper, the design is focused on robots for dependant people. To respect the environmental constraints and to reduce the amount of waste, the robots have to be designed properly. The aim of the X-development method is to ease the manufacturing process thanks to the tight association between the modelling and design phases of smart systems. Our robots are remotely controlled in order to achieve monitoring and social tasks. Caregivers or relatives can control each robot to interact with the dependant person. The robots increase the social interaction of dependant people. During the design phase, we keep in mind to maintain the price of the robot as cheap as possible, because it is the key point in the generalization of this one.