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[EN] Collaborative problem solving (CPS) is an essential soft skill that should be fostered from a young age. Research shows that a good way of teaching such skills is through video games; however, the success and viability of this method may be affected by the technological platform used. In this work we propose a gameful approach to train CPS skills in the form of the CPSbot framework and describe a study involving 80 primary school children on user experience and acceptance of a game, Quizbot, using three different technological platforms: two purely digital (tabletop and handheld tablets) and another based on tangible interfaces and physical spaces. The results show that physical spaces proved to be more effective than the screen-based platforms in several ways, as well as being considered more fun and easier to use by the children. Finally, we propose a set of design considerations for future gameful CPS systems based on the observations made during this study., Spanish Ministry of Economy and Competitiveness and the European Regional Development Fund (project TIN2014-60077-R); Spanish Ministry of Education, Culture and Sport (with fellowship FPU14/00136) and Conselleria d'Educacio, Cultura i Esport (Generalitat Valenciana, Spain) (grant ACIF/2014/214).

[EN] The use of multi-touch devices for all types of users (from children to the elderly) has grown considerably in the recent years. However, despite the huge interest in this technology there is a lack of research addressing usability studies on children with Down's Syndrome. This article evaluates the abilities of these children (aged from 5 to 10 years) when performing a basic set of multi-touch gestures (tap, double tap, long press, drag, scale up and down, rotation) in tablet devices. The results show that regardless of their more limited motor skills, DS children are able to perform most of the evaluated multi-touch gestures with success rates close to 100% and that this technology could be fully exploited for developing applications targeted specifically at this type of user., Spanish Ministry of Economy and Competitiveness and funded by the European Development Regional Fund (EDRF-FEDER) with the project TIN2014-60077-R (SUPEREMOS). This work was also supported by a pre-doctoral fellowship within the Formacion de Profesorado Universitario (FPU) program from the Spanish Ministry of Education, Culture and Sports to V. Nacher (FPU14/00136) and by a pre-doctoral scholarship given by the SENESCYT (Secretaria Nacional de Educacion Superior, Ciencia y Tecnologia e Innovacion) of the government of Ecuador (No. 381-2012) to Doris Caliz.