Our society is dependent on information and the different technologies and artifacts that gives us access to it. However, the technologies we have come to depend on in different aspects of our lives are imperfect and during the past decade, these imperfections have been the target of identity thieves, cyber criminals and malicious persons within and outside the organization. These malicious persons often target networks of organizations such as hospitals, banks and other financial organizations. Access to these networks are often gained by sidestepping security mechanisms of computer-systems connected to the organization’s network. Often, the goal of computer-systems security mechanisms is to prevent or detect threats; or recover from an eventual attack. However, despite huge investments in IT-security infrastructure and Information security, over 95% of banks, hospitals and government agencies have at least 10 malicious infections bypass existing security mechanisms and enter their network without being detected. This has resulted in the loss of valuable information and substantial sums of money from banks and other organizations across the globe. From early research in this area, it has been discovered that the reason why security mechanisms fail is because it is often used incorrectly or not used at all.  Specifically, most users find the security mechanisms on their computers too complicated and they would rather not use it. Therefore, previous research have focused on making computer-systems security usable or simplifying security technology so that they are “less complicated” for all types users, instead of designing computers that are both usable and secure. The problem with this traditional approach is that security is treated as an “add-on” to a finished computer-system design. This study is an attempt to change the traditional approach by adjusting two phases of a computer-system design model to incorporate the collection of usability as well as security requirements. Guided by the exploratory case study research design, I gained new insights into a situation that has shocked security specialists and organizational actors alike. This study resulted in the creation of a methodology for designing usable and secure computer-systems. Although this method is in its rudimentary stage, it was tested using an online questionnaire. Data from the literature study was sorted using a synthesis matrix; and analyzed using qualitative content analysis. Some prominent design and security models and methodologies discussed in this report include User-Centered System Design (UCSD), Appropriate and Effective Guidance for Information Security (AEGIS) and Octave Allegro. / Vårt samhälle är beroende av information och olika tekniker och artefakter som ger oss tillgång till den. Men tekniken vi förlitar oss på i olika aspekter av våra liv är ofullkomliga och under det senaste decenniet, har dessa brister varit föremål för identitetstjuvar, cyberbrottslingar och illvilliga personer inom och utanför organisationen. Dessa illvilliga personer riktar ofta sig till nätverk av organisationer såsom sjukhus, banker och andra finansiella organisationer. Tillgång till dessa nätverk uppnås genom att kringgå säkerhetsmekanismer av datorsystem anslutna till organisationens nätverk.   Målet med datorsystemsäkerhet är att förhindra eller upptäcka hot; eller återhämta sig från eventuella attacker. Trots stora investeringar i IT-säkerhet infrastruktur och informationssäkerhet, över 95 % av banker, sjukhus och myndigheter har minst 10 skadliga infektioner kringgå befintliga säkerhetsmekanismer och träda in i sitt nätverk utan att upptäckas. Detta har lett till förlust av värdefulla informationer och stora summor av pengar från banker och andra organisationer över hela världen. Från tidigare forskning inom detta område, har det visat sig att anledningen till att säkerhetsmekanismer misslyckas beror ofta på att den används på ett felaktigt sätt eller används inte alls. I synnerhet menar de flesta användare att säkerhetsmekanismer på sina datorer är alltför komplicerat. Därför har tidigare forskning fokuserat på att göra datorsystemsäkerhet användbar så att den är "mindre komplicerat" för alla typer av användare, i stället för att designa datorer som både är användbara och säkra. Problemet med detta traditionella synsätt är att säkerheten behandlas som ett "tillägg" till en färdig datorsystemdesign.   Denna studie är ett försök att ändra det traditionella synsättet genom att justera två faser av en datorsystemdesign modell för att integrera insamlingen av användbarhets- samt säkerhetskrav. Styrd av den explorativ fallstudie forskningsdesignen, fick jag nya insikter i en situation som har gäckat säkerhetsspecialister och organisatoriska aktörer. Denna studie resulterade i skapande av en designmetodik för användbara och säkra datorsystem. Även om denna metod är ännu i sin rudimentära fas, testades den med hjälp av en webbenkät. Data från litteraturstudien sorterades med hjälp av en syntesmatris; och analyserades med kvalitativ innehållsanalys. Några framstående design- och säkerhetsmodeller samt metoder som diskuterades i denna uppsats inkludera Användarcentrerad System Design (UCSD), Ändamålsenligt och Effektivt Vägledning för Informationssäkerhet (AEGIS) och Octave Allegro.

Cette thèse a été initiée dans un contexte d’amélioration de l'expérience utilisateur (UX) pour l'analyse des données de Business Intelligence en raison de l'augmentation du volume de données liées à cette activité. D'une part, les besoins psychologiques des utilisateurs portent sur la simplification de l’utilisation des applications analytiques, ils font l’objet de plus en plus d’attention ; d'autre part, les tâches qu'ils sont prêts à mener deviennent de plus en plus complexes ce qui peut entraîner une surcharge de mémoire qui influe sur les performances dans leur réalisation. Pour garantir la prise en compte de ces deux aspects, les designers doivent concevoir des interfaces et fournir des informations appropriées qui répondent à la fois aux besoins des utilisateurs et aux nécessités de leur activité. Dans cette recherche, nous nous sommes intéressés à l'amélioration de la reprise de la tâche suite à une suspension ou à une interruption de celle-ci dans le cadre de l’analyse visuelle de données. La nature multitâche des actions des utilisateurs et les capacités limitées de stockage de la mémoire de travail humaine entraînent des difficultés à s’engager de nouveau dans une tâche qui a été interrompue ou suspendue. Il devient donc avantageux de disposer d'un outil de suppléance de la mémoire qui aide les utilisateurs à se remettre à leur tâche dans des conditions optimales.Une revue de la littérature nous a conduit tout d'abord au positionnement de notre recherche vis à vis de l'approche énactive et de la perception sensorimotrice qui considèrent l'outil comme un artefact configurant l'interaction entre l'utilisateur et la tâche, selon deux états, saisi ou déposé. De ce point de vue, nous avons constaté que le modèle de mémoire cognitiviste utilisé couramment ne considère pas le rôle de l’interaction avec le monde extérieur dans la construction de la mémoire, et par conséquent ignore la dimension saisie des supports et outils dans la construction d’une mémoire. Par conséquent, nous proposons de compléter ce modèle avec un modèle de mémoire incarnée, qui ouvre une nouvelle perspective permettant de concevoir un outil de suppléance mémorielle approprié. Enfin, les principes de conception d’IHM et d’UX nous aident à construire une proposition d’outil et à mener un plan d'expérience mettant en avant le lien entre les modifications des conditions de perception et les modifications de la dynamique d’interaction. En conclusion de cette partie, la problématique générale est introduite avec l’exploration, la mise en œuvre et l’évaluation de la proposition. La première expérience, le test pilote, analyse la perception que peuvent avoir des concepteurs naviguant sur des applications interactives. Cette étude nous a aidé à construire un vocabulaire d'évaluation en conception d’un support de suppléance de la mémoire et nous a guidé pour concevoir un processus expérimental en tenant compte de ces critères. Dans une seconde expérience, nous développons un outil basé sur une fonction que nous appelons le "history path". Cet outil permet d’afficher à l’utilisateur, dans une fenêtre spécifique de l’interface, certaines étapes de résolution d’une tâche antérieure effectuée par ce même utilisateur (ou pour simuler une interruption de tâche). Nous avons mis en place une expérience simple (minimaliste) simulant une résolution de problème qui a été enregistrée pour évaluer dans quelle mesure le history path peut aider l'utilisateur à récupérer efficacement une tâche interrompue. La première partie de cette expérience nous permet de confirmer l’utilité potentielle de cette fonction et nous aide à explorer l’espace de conception. Dans la deuxième partie, nous expérimentons deux outils différents basés sur deux représentations de l’history path, une représentation statique et l’autre dynamique. Les résultats de l'évaluation nous amènent à comprendre les conditions techniques d'une expérience positive pour laquelle la reprise de tâche est facilitée. / This thesis was initiated in the context of enhancing the user experience for analyzing data due to the increase of the volume of data related to this activity. On the one hand, users’ psychological needs for the simple use of analytic applications are paid more attention than before; on the other hand, the task they are willing to conduct is getting more and more complicated, which may cause memory overload that influences the task performance. To ensure that both aspects are taken into account, the designers should provide a proper information and design a proper interface that meets both users’ needs and the requirements of their activity. In this research, we are interested in improving the task recommitment following a task suspension or interruption in the context of a visual data analysis task. The multitasking nature of user actions and limited storage capacity of human working memory cause difficulties in re-engaging an interrupted or suspended task. Therefore, it is beneficial to have a memory supplementation tool that supports users to recommit their task in optimal conditions. A literature review first leads to the positioning of our research on the enactive approach and sensorimotor perception that consider the tool as an artifact configuring the interaction between the user and the task, in two modes the “put down” mode and the “in hand” mode. From this point of view, we have found that the commonly used cognitive memory model ignores the role of interaction with the external world in the formation of the memory, and consequently ignores the “in hand” dimension of the artifacts in one memory construction. Therefore, we complete this model with the embodied memory, which gives us a new perspective to design an appropriate memory tool that serves as a supplementation of our perceptual system. Finally, the design principles in human-computer interaction and UX helped us build a tool and conduct an experimental plan highlighting the link between changes in perception conditions and changes in the dynamics of interaction. As a conclusion, the research problem is introduced in terms of how we can provide users with a relevant context to recommit to resolving a task after interruption. The design proposal needs to be explored, designed and evaluated. The first experiment, the exploratory study, analyzes the perception of interactive applications by experienced designers. This study helped us construct a vocabulary of evaluation of the design for a memory supplementation support and guided us for the design considering these criteria. In the second experiment, we develop a tool based on a function that we call the “history path”, which permits to show, in a specific window of the user interface, some of the steps of a previous task resolution that a user has performed during previous experience (or to simulate a resolution task interruption). We set up a simple (minimalist) experiment simulating a problem-solving task, which was recorded to evaluate the extent to which a history path support can help the user for efficient recovering of an interrupted task. The first part of this experiment allows us to confirm the potential use of this function and helps us explore the design space. In the second part, we experiment two different tools, based on two history path representations, a static one and a dynamic one. The evaluation results allow us to understand the technical conditions of a positive experience for which task recovery is facilitated. In this second experiment, several means for recording the user experience were mobilized: the evaluation of the durations and gaze frequencies on area of interest in the interface window by eye tracking, the recording of the verbalizations during the RTA (Retrospective Think Aloud) session, and the semantic evaluation.

Due to the fastest growing senior population, age-related cognitive impairments, including Alzheimer's disease, are becoming among the most common diseases in the United States. Currently, prevention through delay is considered the best way to tackle Alzheimer's disease and related dementia, as there is no known cure for those diseases. Early detection is crucial, in that screening individuals with Mild Cognitive Impairment may delay its onset and progression. For my dissertation work, I investigate how computing technologies can help medical practitioners detect and monitor cognitive impairment due to dementia, and I develop a computerized sketch-based screening tool. In this dissertation, I present the design, implementation, and evaluation of the ClockMe System, a computerized Clock Drawing Test. The traditional Clock Drawing Test (CDT) is a rapid and reliable instrument for the early detection of cognitive dysfunction. Neurologists often notice missing or extra numbers in the clock drawings of people with cognitive impairments and use scoring criteria to make a diagnosis and treatment plan. The ClockMe System includes two different applications - (1) the ClockReader for the patients who take the Clock Drawing Test and (2) the ClockAnalyzer for clinicians who use the CDT results to make a diagnosis or to monitor patients. The contributions of this research are (1) the creation of a computerized screening tool to help clinicians identify cognitive impairment through a more accessible and quick-and-easy screening process; (2) the delivery of computer-collected novel behavioral data, which may offer new insights and a new understanding of a patient's cognition; (3) an in-depth understanding of different stakeholders and the identification of their common user needs and desires within a complicated healthcare workflow system; and (4) the triangulation of multiple data collection methods such as ethnographical observations, interviews, focus group meetings, and quantitative data from a user survey in a real-world deployment study.

With the improvement of multimedia technologies such as broadband-enabled HDTV, video on demand and internet TV, the computer and the TV are merging to become a single device. Moreover the previously cited technologies as well as DVD or Blu-ray can provide menu navigation and interactive content. The growing interest in video conferencing led to the integration of the webcam in different devices such as laptop, cell phones and even the TV set. Our approach is to directly use an embedded webcam to remotely control a TV set using hand gestures. Using specific gestures, a user is able to control the TV. A dedicated interface can then be used to select a TV channel, adjust volume or browse videos from an online streaming server. This approach leads to several challenges. The first is the use of a simple webcam which leads to a vision based system. From the single webcam, we need to recognize the hand and identify its gesture or trajectory. A TV set is usually installed in a living room which implies constraints such as a potentially moving background and luminance change. These issues will be further discussed as well as the methods developed to resolve them. Video browsing is one example of the use of gesture recognition. To illustrate another application, we developed a simple game controlled by hand gestures. The emergence of 3D TVs is allowing the development of 3D video conferencing. Therefore we also consider the use of a stereo camera to recognize hand gesture.

Although most modern, highly-computerized flight decks are known to be robust to small disturbances and failures, humans still play a crucial role in advanced decision making in off-nominal situations, and accidents still occur because of poor human-automation interaction. In addition to the physical state of the environment, operators now have to extend their awareness to the state of the automated flight systems. To guarantee the accuracy of this knowledge, humans need to know the dynamics or approximate versions of the dynamics that rule the automation. The operator's situation awareness can decline because of a deficient mental model of the aircraft and an excessive workload. This work describes the creation of a computational human agent model simulating cognitive constructs such as situation awareness and mental models known to capture the symptoms of poor human-automation interaction and provide insight into more comprehensive metrics supporting the validation of automated systems in aviation.

Transformations to socio-technical systems may be enacted at fairly low levels, i.e., through changes in technology, processes, information and workers, to obtain a change in system level performance. This thesis provides a conceptual framework and a simulation platform to a priori computationally analyze the impact of such transformations. This thesis builds on the principles of cognitive engineering to describe the components of the work environment, i.e., technology, processes and information, in work relevant ways and using a structure-preserving model, i.e., a model form that describes the models using the same attributes and structure as used by system designers. This thesis also builds on the principles of agent-based modeling to model workers and their interactions with the work environment. These models are specified through a conceptual framework that includes declarative models describing which components are included within the system and their interrelations, and object-oriented models of those complex, dynamic behaviors that cannot be adequately described declaratively. Declarative modeling enables easy composition and modification of component models and, by declaring all required components collectively, a system model. This thesis established an XML representation for the declarative models, and developed a mechanism that automatically assembles, from the individual components' specifications and interrelations, a network-level model of the entire system in XML, which can serve to analyze network dependencies between components. The combination of the declarative and object-oriented models also enables computational simulations to predict the system performance that will emerge from a network of components when placed in a given scenario. Thus, this thesis also developed an agent-based simulation platform to support analysis of emergent behavior. The theoretical contributions of this thesis include the conceptual framework as a broadly applicable and structure-preserving representation of the important aspects of socio-technical system behavior, and associated extensions to cognitive engineering descriptions of the work environment. These insights, combined with the simulation platform, also enable computational modeling, analysis and prediction of socio-technical system performance with a comprehensiveness and detail not possible before. The theoretical and practical utility of these developments is demonstrated through a case study in air traffic control.

O Design Participativo (DP) originou-se na Escandinávia em meados dos anos 70, em um momento em que os trabalhadores, por meio de sindicatos trabalhistas, reivindicavam um maior empoderamento no processo de tomada de decisão para a adoção da tecnologia em seu ambiente de trabalho. O DP tornou-se uma metodologia que aborda o envolvimento de designers e não designers trabalhando em conjunto nas atividades de design de um projeto por meio de práticas participativas. Tais práticas de DP são comumente exploradas de forma presencial, que por sua vez, utilizam técnicas de DP que auxiliam a mediá-las. Justificado pela carência de práticas de Design Participativo Distribuído (DPD), em que os stakeholders envolvidos estão dispersos geograficamente, esta dissertação de mestrado apresenta os benefícios, limitações e adaptações necessárias para adoção de técnicas de DP em práticas de DPD por meio de sistemas colaborativos. Escolheu-se a técnica de BrainDraw para ser investigada no escopo deste estudo e buscar respostas para as questões desta pesquisa. Os resultados desta dissertação envolvem uma analogia entre as fases da metodologia de DP definida por Spinuzzi e o estudo sobre práticas de DP no ciclo de vida do desenvolvimento de software de Muller, Hallewell e Dayton, que propicia condições para que pesquisadores e desenvolvedores decidam sobre quais técnicas de DP são mais indicadas para serem empregadas em contextos distribuídos. Também foi realizada a análise de requisitos, por meio de oficinas participativas, para um sistema colaborativo denominado de Sistema DEA (Design Participativo em Ação), para adoção de práticas de BrainDraw em contexto distribuído. O desenvolvimento do protótipo do Sistema DEA e a avaliação empírica e participativa do mesmo foram realizadas com o propósito de buscar respostas para o objetivo desta pesquisa. A partir dos resultados coletados durante a avaliação, apresenta-se os benefícios, diferenças e adaptações para a adoção do BrainDraw por meio de sistemas colaborativos. Por fim, detalhe-se também as principais contribuições desta pesquisa para a computação e para a sociedade, além de discussões sobre suas respectivas limitações e trabalhos futuros. / Participatory Design (PD) originated in Scandinavia in the mid-1970s, in a period that workers, through labor unions, were requesting more empowerment in the decision-making process related to adoption of technology in the workplace. PD became a methodology that addresses involvement of designers and non-designers working together in design activities of a project through participatory practices. Those PD’s practices are commonly explored with co-located participants, using PD’s techniques to support and mediate interaction across participants. Justified by absence of Distributed Participatory Design’s practices (DPD), which stakeholders are located in different geographic spaces, this master’s thesis presents the benefits, limitations and adaptations necessary to adopt PD’s techniques in DPD’s practices through collaborative systems. The BrainDraw technique was chosen to be investigated in the scope of this study and to help finding answers for this research questions. The results of this research involve an analogy between the phases of the PD methodology defined by Spinuzzi and PD practices in the software development life cycle by Muller, Hallewell and Dayton, that helps researchers and developers to decide about which technique of PD is more suitable to be used in distributed contexts. It also presents three participatory workshops for requirements analysis of a collaborative system called DEA System (Participatory Design in Action) to adopt practices of BrainDraw in a distributed context. The development and empirical and participatory evaluation of DEA System were conducted with the purpose of seeking answers to the objective of this research. Based on this research’s results, we present benefits, differences and necessary adaptations identified to conduct BrainDraw practices in distributed contexts through collaborative systems. Finally, we present the contributions of this research to Computer Science area and to society, and also some discussions about its limitations and future works.

O público idoso, crescente no Brasil e cada vez mais adepto do uso da internet e dos meios digitais, necessita de atenção quando o assunto é inclusão digital, pois podem apresentar limitações físicas e cognitivas que dificultam a realização de tarefas que requeiram o uso computador. Considerar estes usuários e envolvê-los no processo de desenvolvimento de materiais didáticos no formato digital, utilizando técnicas de Design Participativo, pode amenizar a rejeição relacionada à utilização deste material por este público. Com isso, definiu-se como objetivo geral desta pesquisa analisar a aplicação de técnicas de Design Participativo com o público idoso para a inclusão digital. Nesta pesquisa foram aplicadas as técnicas de Design Participativo Storytelling Workshop, Criação de linguagens comuns e Braindraw com idosos, para o desenvolvimento de um exemplo de material didático digital voltado a este público. Os passos adotados para atingir o objetivo geral foram: estudo bibliográfico por meio de um fichamento e de uma revisão sistemática de literatura; coleta de dados por meio de entrevistas, para investigação das demandas de inclusão digital do público idoso; aplicação de técnicas de Design Participativo com idosos, cujo objetivo foi o levantamento de requisitos para o desenvolvimento do material didático. Após a análise das informações obtidas com a aplicação das técnicas de Design Participativo foram identificados e listados alguns pontos de observação, que tratam das preferências destes usuários na utilização de materiais didáticos digitais. Com estes pontos de observação foi proposto um exemplo de material didático no formato digital, caracterizado como Recurso Educacional Aberto, para aprendizagem de uma ferramenta de comunicação via internet. Este material foi validado por usuários idosos e atendeu a maioria dos requisitos. Por fim, constatou-se que a atividade participativa para os idosos gera resultados positivos e pode ser adotada no desenvolvimento de tecnologias para este público. / The elderly public, growing in Brazil and increasingly adept at using the internet and digital media, needs attention when it comes to digital inclusion, since they may present physical and cognitive limitations that make it difficult to perform tasks that require computer use. Considering these users and involving them in the process of developing teaching materials in the digital format, using Participatory Design techniques, can ease the rejection related to the use of this material by this public. With this, it was defined as a general objective of this research to analyze the application of Participatory Design techniques with the elderly public for digital inclusion. In this research were applied the techniques of Participatory Design Storytelling Workshop, Creation of common languages and Braindraw with the elderly, for the development of an example of digital didactic material aimed at this public. The steps taken to reach the general objective were: a bibliographic study through a file and a systematic literature review; Data collection through interviews, to investigate the digital inclusion demands of the elderly public; Application of Participatory Design techniques with the elderly, whose objective was the survey of requirements for the development of didactic material. After analyzing the information obtained with the application of Participatory Design techniques, some observation points were identified and listed, which address the preferences of these users in the use of digital didactic materials. With these observation points, an example of didactic material in the digital format, characterized as Open Educational Resource, was proposed for learning an internet communication tool. This material was validated by elderly users and met most of the requirements. Finally, it was verified that the participative activity for the elderly generates positive results and can be adopted in the development of technologies for this public.

O público idoso, crescente no Brasil e cada vez mais adepto do uso da internet e dos meios digitais, necessita de atenção quando o assunto é inclusão digital, pois podem apresentar limitações físicas e cognitivas que dificultam a realização de tarefas que requeiram o uso computador. Considerar estes usuários e envolvê-los no processo de desenvolvimento de materiais didáticos no formato digital, utilizando técnicas de Design Participativo, pode amenizar a rejeição relacionada à utilização deste material por este público. Com isso, definiu-se como objetivo geral desta pesquisa analisar a aplicação de técnicas de Design Participativo com o público idoso para a inclusão digital. Nesta pesquisa foram aplicadas as técnicas de Design Participativo Storytelling Workshop, Criação de linguagens comuns e Braindraw com idosos, para o desenvolvimento de um exemplo de material didático digital voltado a este público. Os passos adotados para atingir o objetivo geral foram: estudo bibliográfico por meio de um fichamento e de uma revisão sistemática de literatura; coleta de dados por meio de entrevistas, para investigação das demandas de inclusão digital do público idoso; aplicação de técnicas de Design Participativo com idosos, cujo objetivo foi o levantamento de requisitos para o desenvolvimento do material didático. Após a análise das informações obtidas com a aplicação das técnicas de Design Participativo foram identificados e listados alguns pontos de observação, que tratam das preferências destes usuários na utilização de materiais didáticos digitais. Com estes pontos de observação foi proposto um exemplo de material didático no formato digital, caracterizado como Recurso Educacional Aberto, para aprendizagem de uma ferramenta de comunicação via internet. Este material foi validado por usuários idosos e atendeu a maioria dos requisitos. Por fim, constatou-se que a atividade participativa para os idosos gera resultados positivos e pode ser adotada no desenvolvimento de tecnologias para este público. / The elderly public, growing in Brazil and increasingly adept at using the internet and digital media, needs attention when it comes to digital inclusion, since they may present physical and cognitive limitations that make it difficult to perform tasks that require computer use. Considering these users and involving them in the process of developing teaching materials in the digital format, using Participatory Design techniques, can ease the rejection related to the use of this material by this public. With this, it was defined as a general objective of this research to analyze the application of Participatory Design techniques with the elderly public for digital inclusion. In this research were applied the techniques of Participatory Design Storytelling Workshop, Creation of common languages and Braindraw with the elderly, for the development of an example of digital didactic material aimed at this public. The steps taken to reach the general objective were: a bibliographic study through a file and a systematic literature review; Data collection through interviews, to investigate the digital inclusion demands of the elderly public; Application of Participatory Design techniques with the elderly, whose objective was the survey of requirements for the development of didactic material. After analyzing the information obtained with the application of Participatory Design techniques, some observation points were identified and listed, which address the preferences of these users in the use of digital didactic materials. With these observation points, an example of didactic material in the digital format, characterized as Open Educational Resource, was proposed for learning an internet communication tool. This material was validated by elderly users and met most of the requirements. Finally, it was verified that the participative activity for the elderly generates positive results and can be adopted in the development of technologies for this public.

Orientador: Heloisa Vieira da Rocha / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-08-11T08:22:19Z (GMT). No. of bitstreams: 1 Oliveira_Rodrigode_D.pdf: 16111521 bytes, checksum: 6c77c064d781230212b6c88feb0bcb6c (MD5) Previous issue date: 2008 / Resumo: Com a miniaturização dos componentes digitais e o vasto desenvolvimento tecnológico dos últimos anos, a sociedade tem presenciado a redefinição dos "computadores pessoais" pelo advento dos dispositivos móveis. Além da inovação, eles introduziram o desafio do design multi-dispositivo para as aplicações desktop. Enquanto algumas abordagens criaram interfaces móveis sem aproveitar qualquer modelo, outras buscaram adaptações automáticas visando reduzir a sobrecarga de designo Em ambas, o foco do design deixou de ser o usuário, tornando as interfaces tão diferentes ao ponto de comprometerem a usabilidade na realização de uma mesma tarefa em vários dispositivos. Esta tese afirma que não existe uma abordagem de design multi-dispositivo capaz de garantir boa usabilidade em todos os contextos porque o usuário pode escolher apenas uma forma de acesso à aplicação ou alternar seu uso por meio de vários dispositivos. No primeiro caso, o usuário aprende a usar a interface para realizar suas tarefas, sendo relevante uma abordagem que aproveite os recursos do dispositivo e trate suas limitações. No segundo, o usuário já conhece uma das interfaces, o que gera uma expectativa no uso das demais. Logo, é necessário combinar abordagens com objetivos diferentes para atender ao usuário de acordo com o seu contexto de uso. Neste sentido, propõe-se o design multi-dispositivo por meio da preservação de uma hierarquia de prioridades de consistência definida em três níveis. Enquanto os dois primeiros dão suporte à expectativa do usuário em contextos de uso alternado (propensos à execução de tarefas em dispositivos diferentes) e migração de tarefas (iniciando tarefas com um dispositivo e concluindo com outro), o terceiro nível garante a personalização das tarefas de maior interesse visando eficiência e satisfação de uso em um dispositivo específico. A avaliação desta metodologia foi feita por meio de um experimento com três interfaces de pocket PC construídas a partir de uma aplicação desktop do domínio de Educação a Distância: a primeira delas era uma réplica da original (Migração Direta), a segunda não mantinha consistência de layout e era baseada em um processo de design personalizado adequado ao dispositivo (Linear) e a terceira aplicava apenas os dois primeiros níveis da hierarquia de prioridades (Overview). Os resultados da avaliação subjetiva mostraram que a abordagem Overview foi capaz de manter o modelo mental do usuário com maior precisão por preservar os atributos de facilidade, eficiência e segurança de uso na interação inter-dispositivo. Além disso, os resultados medidos para a eficácia (exatidão das respostas) e eficiênciá (tempo médio de execução das tarefas) foram iguais ou melhores com essa abordagem. Por outro lado, os usuários revelaram uma preferência pela personalização de tarefas presente na abordagem Linear. Este resultado dá suporte à proposta desta tese, mostrando que a eficácia gerada pelos dois primeiros níveis da hierarquia de prioridades (percepção e execução das tarefas) deve ser combinada com o terceiro nível de personalização. Para isso, sugere-se a disponibilização de padrões de interface criados pelo designer para escolha do usuário durante a interação. Essa combinação deve garantir usabilidade no acesso a uma aplicação feito sempre por um mesmo dispositivo ou em contextos de uso alternado e migração de tarefas / Abstract: With the miniaturization of digital components and the vast technological development of the past years, society has remarked the redefinition of "personal computers" by the advent of modern mobile devices. Besides the innovation, these handhelds also introduced the challenge to develop multi-device interfaces for today's desktop applications. While some created mobile interfaces from scratch to get the best from the devices, others looked for automatic adaptations to reduce the load imposed to the designeI. In both cases, the user wasn't the focus anymore, which resulted interfaces so different from each other to the point of compromising usability when peHorming one task on many devices. This thesis claims that there is no multi-device approach capable to provi de full usability in every context because the user may choose only one interface to access the application or interchange its use via many devices. In the first case, the user learns to perform tasks with the given device, which makes relevant an approach that takes advantage of its resources and solves its limitations. In the second, the user already knows one of the available interfaces, which generates an expectation for the others. Therefore, it is necessary to combine approaches with different goals and suit the user according to the appropriate context. In this sense, we propose multi-device design via maintenance of a consistency priorities hierarchy defined in three levels. The first two levels give support to the user's expectation in contexts of interchange (prone to task execution with different devices) and task migration (starting tasks with one device and finishing with other). On the other side, the third level provides task personalization according to the user's interest towards higher efficiency and satisfaction of use with a specific device. The evaluation of this methodology was conducted by an experiment with three pocket PC interfaces designed from an e-learning desktop application: the first interface was an exact replica of the original desktop version (Direct Migration), the second didn't maintain layout consistency and was based in a personalized design process adequate to the device (Linear) while the third applied only the first two levels of the consistency priorities hierarchy (Overview). The subjective evaluation results pointed the Overview approach as the best to maintain the user's mental model by preserving easiness, efficiency and safety of use on inter-device interaction. Additionally, both measured efficacy (task result accuracy) and efficiency (task execution mean time) were the same or even better with this approach. On the other hand, users revealed their preference for the task personalization present in the Linear approach. This result gives support to our proposal, corroborating that the efficacy generated by the first two levels of the consistency priorities hierarchy (task perception and execution) should be combined with the third level of personalization. This could be done by letting designers create interface patterns and make them available to users during interaction. Such combination should guarantee usability while constantly accessing one application through the same device or in contexts of alternated use and task migration / Doutorado / Doutor em Ciência da Computação