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e ageing of the population poses a threat to both public and private health and social systems. In the last 50 years, life expectancy has increased by an average of 20 years, and by the year 2050, life expectancy will exceed 90 years of age. However, quality of life in the last years of life is not guaranteed due to conditions such as functional decline and frailty, ultimately progressing to disability. us, the detection of such a condition in time is of utmost importance. is paper presents an ultrasonic sensor-based gait speed measurement device controlled via a mobile interface, which permits patients to self-assess physical performance. e system was developed and validated in an iterative process involving a total of 28 subjects (21 in the rst round and 7 in the second one). After rst evaluation at Hospital Universitario de Getafe, some technical problems arose whereas usability testing was well evaluated. e second version addressing the identi ed issues was technically validated at university premises with good and promising results. Future work envisages deployment of the system developed at subjects' homes to be remotely and unobtrusively monitored.

Cross-platform development frameworks for mobile applications promise important advantages in cost cuttings and easy maintenance, posing as a very good option for organizations interested in the design of mobile applications for several platforms. Given that platform conventions are especially important for the User eXperience (UX) of mobile applications, the usage of a framework where the same code defines the behavior of the app in different platforms could have a negative impact in the UX. This paper describes a study where two independent teams have designed two different versions of a mobile application, one using a framework that generates Android and iOS versions automatically, and another team using native tools. The alternative versions for each platform have been evaluated with 37 users with a combination of a laboratory usability test and a longitudinal study. The results show that differences are minimal in the Android platform, but in iOS, even if a reasonably good UX can be obtained with the usage of this framework by an DX-conscious design team, a higher level of UX can be obtained directly developing with a native tool.