The complex needs of people with dementia can create challenges when designing care environments. A Human Factors and Ergonomics (HFE) approach to the design of dementia care environments was used to address this challenge, and support wellbeing and independence for system users. Four individual personas (Alison, Barry, Christine and David) and a couple persona (Chris and Sally) were developed to represent the needs of people living with dementia. The aim was to facilitate the exchange of information and expertise between stakeholders and improve understanding of the characteristics of system users. An evidence-based approach involved extracting information from design, dementia, and clinical literature. This was followed by an iterative persona development process and a validation exercise to review the concept, content and applications. This paper outlines the development process, describes each persona and discusses current and potential applications.

When ergonomic criteria are separately applied to the design of chairs, the feeling of comfort is not guaranteed. In this case, the aesthetic and perceptive features of the chair provide the sensations of comfort, and several studies have determined that comfort and discomfort present some characteristics that make them different from each other. Moreover, early perceptions by the user remain invariable when there is no interaction between the person and the object. Therefore, it can be assumed that if a device is considered comfortable after an initial experience of use, it may well not be thought as such after extended use. Based on this, the present research study aimed at establishing the differences in the perceptions of comfort of two chairs before and after extended sitting posture. Six subjects participated in this study, all they were women from 20 to 45 years of age, who usually perform office work in extended sitting posture, with a body mass index (BMI) ranging between 20 and 30 Kg/m2. In the experiment, four office tasks were assigned (reading, transcribing a text, handwriting and searching on the internet) during sixty minutes. The experiment was divided into two sessions, to use the two chairs subject of the study. Each participant was assessed at the same hour but on two different days. By means of the semantic differential, evaluations of visual perception were carried out by the participants before and after using the chair. The results reveal differences in the perception evaluation of both chairs before and after their use. In the case of the chair a, the assessment of the adjectives never decreased. This study shows that the pleasure provided by a product is not static and it does evolve by product time of use and manipulation. Even though there were no statistical differences in the adjective pairs studied when only one chair was examined, it was demonstrated that its perception might improve or worsen on the basis of time. Similarly, this perceptual behavior is not indifferent to the object, finding significant differences before and after use when comparing the chairs. Finally, this analysis tool provides better evidence on product functionality by indicating whether there are failures in the proposed design. KEYWORDS:Comfort, Semantic differential, Visual perception. RESUMENCuando los criterios ergonómicos se aplican por separado al diseño de las sillas, la sensación de comodidad no está garantizada. En este caso, las características estéticas y perceptivas de la silla proporcionan las sensaciones de confort, y varios estudios han determinado que el confort y el malestar presentan algunas características que los hacen diferentes unos de otros. Además, los juicios iniciales del usuario permanecen invariables cuando no hay interacción entre la persona y el objeto. Por lo tanto, se puede suponer que, si un dispositivo se considera cómodo después de una experiencia inicial de uso, puede no ser pensado como tal después del uso prolongado. A partir de esto, el presente estudio de inves...