Structured data stores have been the dominating technologies for the past few decades. Although dominating, structured data stores lack the functionality to handle the ‘Big Data’ phenomenon. A new technology has recently emerged which stores unstructured data and can handle the ‘Big Data’ phenomenon. This study describes the development of an artefact to aid in the analysis of NoSQL document data stores in terms of relational database model constructs. Design science research (DSR) is the methodology implemented in the study and it is used to assist in the understanding, design and development of the problem, artefact and solution. This study explores the existing literature on DSR, in addition to structured and unstructured data stores. The literature review formulates the descriptive and prescriptive knowledge used in the development of the artefact. The artefact is developed using a series of six activities derived from two DSR approaches. The problem domain is derived from the existing literature and a real application environment (RAE). The reviewed literature provided a general problem statement. A representative from NFM (the RAE) is interviewed for a situation analysis providing a specific problem statement. An objective is formulated for the development of the artefact and suggestions are made to address the problem domain, assisting the artefact’s objective. The artefact is designed and developed using the descriptive knowledge of structured and unstructured data stores, combined with prescriptive knowledge of algorithms, pseudo code, continuous design and object-oriented design. The artefact evolves through multiple design cycles into a final product that analyses document data stores in terms of relational database model constructs. The artefact is evaluated for acceptability and utility. This provides credibility and rigour to the research in the DSR paradigm. Acceptability is demonstrated through simulation and the utility is evaluated using a real application environment (RAE). A representative from NFM is interviewed for the evaluation of the artefact. Finally, the study is communicated by describing its findings, summarising the artefact and looking into future possibilities for research and application. / MSc (Computer Science), North-West University, Vaal Triangle Campus, 2014

Many countries (especially developing countries) are plagued with critical healthcare issues such as chronic, infectious and pandemic diseases, a lack of basic healthcare programmes and facilities and a shortage of skilled healthcare workers. E-Health (healthcare based on the Internet technologies) promises to overcome some problems related to the reach of healthcare in remote communities. Electronic Health Record (EHR) (consisting of all diagnostic information related to a patient) forms the core of any E-Health system. Hence the success of an E-Health system is very much dependent on the success of the EHR systems. Although interest in automating the health record is generally high, the literature informs us that they do not always succeed in terms of adoption rate and/or acceptance, even in developed countries. The success of the adoption tends to be low for resource constrained (e.g. insufficient E-Health infrastructure) developing countries. As part of the effort to enhance EHR acceptance, readiness assessment for the innovation becomes an essential requirement for the successful implementation and use of EHR (and hence E-Health). Based on a thorough literature review, several research gaps have been identified. In order to address these gaps, this thesis (based on design science research methodology) presents E-Health Readiness Assessment Methodology (EHRAM). It involves a new E-Health Readiness Assessment Framework (EHRAF), an assessment process and several techniques for analysing the assessment data to arrive at a readiness score. The EHRAF (Model) integrates the components from healthcare providers?? and organisational perspectives of existing E-Health readiness evaluation frameworks. The process of EHRAM (Method) starts with the development of a set of hierarchical evaluation criteria based on EHRAF. This leads to the questionnaire development for data collection. The data is analysed in EHRAM using a number of statistical and data mining techniques. The instantiation part of the design science research involves an automated tool for the implementation of EHRAM and its application through a case study in a developing country.

An issue tracking system is a vital part of a company’s structure and organization. This system is primarily client-based and is only available through a client on a computer or the like. Because of this type of structure, the system is often limited to an internal level. However, implementing a web-based issue tracking system results in a wider availability and usability for users by providing the system to a mobile level. Since this study aims to develop and implement an artifact (web-based issue tracking system), then evaluate its usability, the research methodology: Design Science Research is appropriate for this study as its purpose is to implement and evaluate an artifact as a solution to a phenomenon or problem. A client-based issue tracking system in a business means that customers to a certain company only has the opportunity to monitor their issues if they have mutual remote-control capabilities and the same type of system. With a mostly quantitative questionnaire, designed according to the acceptance model Unified Theory of Acceptance and Use of Technology (UTAUT), data was collected regarding the usefulness of the artifact. The survey respondents were exclusively users of the Pyramid enterprise resource system. The result in accordance of UTAUT showed a positive attitude towards implementation and usability of the artifact, thus, making the conclusion of the study a positive attitude towards a web-based issue tracking system, as users of an enterprise resource planning system perceived the artifact as useful and at least as functional as the existing client-based implementation.

Esta pesquisa foi motivada pela observação de um problema prático com potenciais contribuições teóricas. O problema em questão é a dificuldade de gerenciar projetos complexos de construção de modo que os objetivos estratégicos de sua implementação sejam alcançados, problema observado em um complexo programa de reestruturação urbana na cidade de Porto Alegre. Estudos indicam que nas últimas décadas houve um aumento na complexidade de gestão de projetos que resultou em desafios para as práticas gerenciais tradicionalmente adotadas. Alguns autores relacionam esse aumento de complexidade com uma demanda, cada vez maior, de compreender como projetos estão alinhados com os objetivos estratégicos e como irão contribuir para a geração dos benefícios esperados pelos diversos agentes intervenientes de um projeto. Dentro deste contexto, a falta de suporte dado pelas tradicionais praticas gerenciais é apontada. As críticas focam não só na falta de alinhamento estratégico e na dificuldade de gerenciar interesses conflitantes, mas também na dificuldade de lidar com a susceptibilidade desses projetos ao contexto politico, econômico e social no qual se inserem, e com a dinâmica desse contexto. Dentro deste contexto, foram identificadas duas abordagens gerenciais que emergem no contexto da construção civil em resposta às deficiências observadas: a Benefits Realisation Approach (BeReal) e o Lean Project Delivery System (LPDS). O foco da literatura existente sobre essas abordagens é predominantemente de caráter prescritivo, oferecendo modelos e métodos para sua aplicação. Identificou-se portanto a necessidade de avaliar a contribuição dessas abordagens para lidar com os desafios observados e contribuir para a melhoria do suporte a geração de valor em projetos complexos. Uma terceira abordagem, a Logical Framework Approach (LFA), utilizada no programa onde o problema foi identificado, também foi avaliada, pois é sugerido na literatura que ela oferece suporte para lidar com alguns aspectos da complexidade dos projetos. O processo de pesquisa envolveu as principais etapas de Design Science Research: encontrar um problema prático e com potencial para contribuição teórica, obter um entendimento deste problema, desenvolver ou identificar potencial solução, testar a solução, avaliando sua utilidade, e avaliar a contribuição teórica desta solução. Neste estudo, ênfase foi dada à avaliação das potenciais soluções identificadas. Três estudos empíricos foram realizados: o primeiro teve como objetivo entender o problema - programa de reestruturação urbana em Porto Alegre/Brasil; o segundo para avaliar as contribuições da adoção da BeReal em um programa de reestruturação de um campus hospitalar em Brighton/Inglaterra; e o terceiro para avaliar as contribuições do LPDS em um projeto de um hospital em San Carlos/Estados Unidos. Os três estudos apresentam diferentes contribuições gerenciais para o suporte a geração de valor em projetos complexos de construção. Tais contribuições são explicadas com base em um referencial teórico desenvolvido, formando um modelo conceitual que explica as mudanças necessárias no contexto de gestão de empreendimentos complexos para um melhor foco na geração de valor e como as diferentes praticas observadas e mecanismos de suporte contribuem para esta mudança. / This research was motivated by a practical problem with potential theoretical contributions. The problem in hand is the difficulty to generate value in complex construction projects, a problem observed in a large urban regeneration programme in Porto Alegre. Past research indicate that in the last decades there was an increase in project complexity, posing challenges to traditional managerial practices. According to some authors, such complexity is partially due to an increasing concern to understand how project’s outputs contribute to generating change and delivering benefits to different stakeholder groups. Within this context, the lack of managerial support provided by traditional project management approaches is pointed out. Firstly because such approaches generally focus on the delivery of a physical product, within time and budget. Secondly, they do not provide support for dealing with the conflicting interests of multiple stakeholders. And thirdly because they do not properly consider that projects are susceptible to their economic, social and political context and subject to changes in such environment. In this research, two managerial approaches that are being used in the construction industry were identified as having potential contributions to improve value generation in complex projects: the Benefits Realisation Approach (BeReal) and the Lean Project Delivery System (LPDS). The literature available about these approaches is mainly prescriptive. Thus, there is still a need to understand why and how such approaches contribute for value generation. A third approach, the Logical Framework Approach (LFA) used where the problem was identified, was also analysed, as the literature suggests it also offers contributions to deal with some aspects of complexity. This research followed a Design Science Research process: finding a practical problem with potential theoretical contributions, framing the problem and searching for potential solutions, understanding how and why the solutions contribute for solving the problem and analyse the theoretical contributions of the solutions. In this study, emphasis was given to the evaluation of potential solutions identified. Three empirical cases were realised: the first one was in a urban regeneration programme in Brazil, aiming to understand the problem; the second was realised in a healthcare infrastructure programme in the UK, to analyse the adoption of BeReal; and the third in a healthcare infrastructure programme in the US, to analyse the adoption of LPDS. The three studies presented different managerial contributions to support value generation. Such contributions are analysed based on a conceptual framework that was devised. The model reveals the underlying concepts of observed managerial practices that contribute towards the improvement of value generation.

Esta pesquisa foi motivada pela observação de um problema prático com potenciais contribuições teóricas. O problema em questão é a dificuldade de gerenciar projetos complexos de construção de modo que os objetivos estratégicos de sua implementação sejam alcançados, problema observado em um complexo programa de reestruturação urbana na cidade de Porto Alegre. Estudos indicam que nas últimas décadas houve um aumento na complexidade de gestão de projetos que resultou em desafios para as práticas gerenciais tradicionalmente adotadas. Alguns autores relacionam esse aumento de complexidade com uma demanda, cada vez maior, de compreender como projetos estão alinhados com os objetivos estratégicos e como irão contribuir para a geração dos benefícios esperados pelos diversos agentes intervenientes de um projeto. Dentro deste contexto, a falta de suporte dado pelas tradicionais praticas gerenciais é apontada. As críticas focam não só na falta de alinhamento estratégico e na dificuldade de gerenciar interesses conflitantes, mas também na dificuldade de lidar com a susceptibilidade desses projetos ao contexto politico, econômico e social no qual se inserem, e com a dinâmica desse contexto. Dentro deste contexto, foram identificadas duas abordagens gerenciais que emergem no contexto da construção civil em resposta às deficiências observadas: a Benefits Realisation Approach (BeReal) e o Lean Project Delivery System (LPDS). O foco da literatura existente sobre essas abordagens é predominantemente de caráter prescritivo, oferecendo modelos e métodos para sua aplicação. Identificou-se portanto a necessidade de avaliar a contribuição dessas abordagens para lidar com os desafios observados e contribuir para a melhoria do suporte a geração de valor em projetos complexos. Uma terceira abordagem, a Logical Framework Approach (LFA), utilizada no programa onde o problema foi identificado, também foi avaliada, pois é sugerido na literatura que ela oferece suporte para lidar com alguns aspectos da complexidade dos projetos. O processo de pesquisa envolveu as principais etapas de Design Science Research: encontrar um problema prático e com potencial para contribuição teórica, obter um entendimento deste problema, desenvolver ou identificar potencial solução, testar a solução, avaliando sua utilidade, e avaliar a contribuição teórica desta solução. Neste estudo, ênfase foi dada à avaliação das potenciais soluções identificadas. Três estudos empíricos foram realizados: o primeiro teve como objetivo entender o problema - programa de reestruturação urbana em Porto Alegre/Brasil; o segundo para avaliar as contribuições da adoção da BeReal em um programa de reestruturação de um campus hospitalar em Brighton/Inglaterra; e o terceiro para avaliar as contribuições do LPDS em um projeto de um hospital em San Carlos/Estados Unidos. Os três estudos apresentam diferentes contribuições gerenciais para o suporte a geração de valor em projetos complexos de construção. Tais contribuições são explicadas com base em um referencial teórico desenvolvido, formando um modelo conceitual que explica as mudanças necessárias no contexto de gestão de empreendimentos complexos para um melhor foco na geração de valor e como as diferentes praticas observadas e mecanismos de suporte contribuem para esta mudança. / This research was motivated by a practical problem with potential theoretical contributions. The problem in hand is the difficulty to generate value in complex construction projects, a problem observed in a large urban regeneration programme in Porto Alegre. Past research indicate that in the last decades there was an increase in project complexity, posing challenges to traditional managerial practices. According to some authors, such complexity is partially due to an increasing concern to understand how project’s outputs contribute to generating change and delivering benefits to different stakeholder groups. Within this context, the lack of managerial support provided by traditional project management approaches is pointed out. Firstly because such approaches generally focus on the delivery of a physical product, within time and budget. Secondly, they do not provide support for dealing with the conflicting interests of multiple stakeholders. And thirdly because they do not properly consider that projects are susceptible to their economic, social and political context and subject to changes in such environment. In this research, two managerial approaches that are being used in the construction industry were identified as having potential contributions to improve value generation in complex projects: the Benefits Realisation Approach (BeReal) and the Lean Project Delivery System (LPDS). The literature available about these approaches is mainly prescriptive. Thus, there is still a need to understand why and how such approaches contribute for value generation. A third approach, the Logical Framework Approach (LFA) used where the problem was identified, was also analysed, as the literature suggests it also offers contributions to deal with some aspects of complexity. This research followed a Design Science Research process: finding a practical problem with potential theoretical contributions, framing the problem and searching for potential solutions, understanding how and why the solutions contribute for solving the problem and analyse the theoretical contributions of the solutions. In this study, emphasis was given to the evaluation of potential solutions identified. Three empirical cases were realised: the first one was in a urban regeneration programme in Brazil, aiming to understand the problem; the second was realised in a healthcare infrastructure programme in the UK, to analyse the adoption of BeReal; and the third in a healthcare infrastructure programme in the US, to analyse the adoption of LPDS. The three studies presented different managerial contributions to support value generation. Such contributions are analysed based on a conceptual framework that was devised. The model reveals the underlying concepts of observed managerial practices that contribute towards the improvement of value generation.

An important issue for healthcare service providers is to achieve high levels of patient satisfaction. Collecting patient feedback about their experience in hospital enables providers to analyse their performance in terms of the levels of satisfaction and to identify the strengths and limitations of their service delivery. A common method of collecting patient feedback is via online portals and the forums of the service provider, where the patients can rate and comment about the service received. A challenge in analysing patient experience collected via online portals is that the amount of data can be huge and hence, prohibitive to analyse manually. In this thesis, an automated approach to patient experience analysis via Sentiment Analysis, Topic Modelling, and Dependency Parsing methods is presented. The patient experience data collected from the National Health Service (NHS) online portal in the United Kingdom is analysed in the study to understand this experience. The study was carried out in three iterations: (1) In the first, the Sentiment Analysis method was applied, which identified whether a given patient feedback item was positive or negative. (2) The second iteration involved applying Topic Modelling methods to identify automatically themes and topics from the patient feedback. Further, the outcomes of the Sentiment Analysis study from the first iteration were utilised to identify the patient sentiment regarding the topic being discussed in a given comment. (3) In the third iteration of the study, Dependency Parsing methods were employed for each patient feedback item and the topics identified. A method was devised to summarise the reason for a particular sentiment about each of the identified topics. The outcomes of the study demonstrate that text-mining methods can be effectively utilised to identify patients’ sentiment in their feedback as well as to identify the themes and topics discussed in it. The approach presented in the study was proven capable of effectively automatically analysing the NHS patient feedback database. Specifically, it can provide an overview of the positive and negative sentiment rate, identify the frequently discussed topics and summarise individual patient feedback items. Moreover, an API visualisation tool is introduced to make the outcomes more accessible to the health care providers.

Web-based service providers have long been required to deliver high quality services in accordance with standards and customer requirements. Increasingly, however, providers are required to think beyond service quality and develop a deeper understanding of their customers’ Quality of Experience (QoE). Whilst models exist that assess the QoE of Web Application, significant challenges remain in defining QoE factors from a Web engineering perspective, as well as mapping between so called ‘objective’ and ‘subjective’ factors of relevance. Specifically, the following challenges are considered as general fundamental problems for assessing QoE: (1) Quantifying the relationship between QoE factors; (2) predicting QoE as well as dealing with the limited data available in relation to subjective factors; (3) optimising and controlling QoE; and (4) perceiving QoE. In response, this research presents a novel model, called QoEWA (and associated software instantiation) that integrates factors through Key Performance Indicators (KPIs) and Key Quality Indicators (KQIs). The mapping is incorporated into a correlation model that assesses QoE, in particular, that of Web Application, with a consideration of defining the factors in terms of quality requirements derived from web architecture. The data resulting from the mapping is used as input for the proposed model to develop artefacts that: quantify, predict, optimise and perceive QoE. The development of QoEWA is framed and guided by Design Science Research (DSR) approach, with the purpose of enabling providers to make more informed decisions regarding QoE and/or to optimise resources accordingly. The evaluation of the designed artefacts is based on a build-and-evaluate cycle that provides feedback and a better understanding of the utilised solutions. The key artefacts are developed and evaluated through four iterations: Iteration 1 utilises the Actual Versus-Target approach to quantify QoE, and applies statistical analysis to evaluate the outputs. Iteration 2: utilises a Machine Learning (ML) approach to predict QoE, and applies statistical tests to compare the performance of ML algorithms. Iteration 3 utilises the Multi-Objective Optimisation (MOO) approach to optimise QoE and control the balance between resources and user experience. Iteration 4 utilises the Agent-Based Modelling approach to perceive and gain insights into QoE. The design of iteration 4 is rigorously tested using verified and validated models.

Esta pesquisa foi motivada pela observação de um problema prático com potenciais contribuições teóricas. O problema em questão é a dificuldade de gerenciar projetos complexos de construção de modo que os objetivos estratégicos de sua implementação sejam alcançados, problema observado em um complexo programa de reestruturação urbana na cidade de Porto Alegre. Estudos indicam que nas últimas décadas houve um aumento na complexidade de gestão de projetos que resultou em desafios para as práticas gerenciais tradicionalmente adotadas. Alguns autores relacionam esse aumento de complexidade com uma demanda, cada vez maior, de compreender como projetos estão alinhados com os objetivos estratégicos e como irão contribuir para a geração dos benefícios esperados pelos diversos agentes intervenientes de um projeto. Dentro deste contexto, a falta de suporte dado pelas tradicionais praticas gerenciais é apontada. As críticas focam não só na falta de alinhamento estratégico e na dificuldade de gerenciar interesses conflitantes, mas também na dificuldade de lidar com a susceptibilidade desses projetos ao contexto politico, econômico e social no qual se inserem, e com a dinâmica desse contexto. Dentro deste contexto, foram identificadas duas abordagens gerenciais que emergem no contexto da construção civil em resposta às deficiências observadas: a Benefits Realisation Approach (BeReal) e o Lean Project Delivery System (LPDS). O foco da literatura existente sobre essas abordagens é predominantemente de caráter prescritivo, oferecendo modelos e métodos para sua aplicação. Identificou-se portanto a necessidade de avaliar a contribuição dessas abordagens para lidar com os desafios observados e contribuir para a melhoria do suporte a geração de valor em projetos complexos. Uma terceira abordagem, a Logical Framework Approach (LFA), utilizada no programa onde o problema foi identificado, também foi avaliada, pois é sugerido na literatura que ela oferece suporte para lidar com alguns aspectos da complexidade dos projetos. O processo de pesquisa envolveu as principais etapas de Design Science Research: encontrar um problema prático e com potencial para contribuição teórica, obter um entendimento deste problema, desenvolver ou identificar potencial solução, testar a solução, avaliando sua utilidade, e avaliar a contribuição teórica desta solução. Neste estudo, ênfase foi dada à avaliação das potenciais soluções identificadas. Três estudos empíricos foram realizados: o primeiro teve como objetivo entender o problema - programa de reestruturação urbana em Porto Alegre/Brasil; o segundo para avaliar as contribuições da adoção da BeReal em um programa de reestruturação de um campus hospitalar em Brighton/Inglaterra; e o terceiro para avaliar as contribuições do LPDS em um projeto de um hospital em San Carlos/Estados Unidos. Os três estudos apresentam diferentes contribuições gerenciais para o suporte a geração de valor em projetos complexos de construção. Tais contribuições são explicadas com base em um referencial teórico desenvolvido, formando um modelo conceitual que explica as mudanças necessárias no contexto de gestão de empreendimentos complexos para um melhor foco na geração de valor e como as diferentes praticas observadas e mecanismos de suporte contribuem para esta mudança. / This research was motivated by a practical problem with potential theoretical contributions. The problem in hand is the difficulty to generate value in complex construction projects, a problem observed in a large urban regeneration programme in Porto Alegre. Past research indicate that in the last decades there was an increase in project complexity, posing challenges to traditional managerial practices. According to some authors, such complexity is partially due to an increasing concern to understand how project’s outputs contribute to generating change and delivering benefits to different stakeholder groups. Within this context, the lack of managerial support provided by traditional project management approaches is pointed out. Firstly because such approaches generally focus on the delivery of a physical product, within time and budget. Secondly, they do not provide support for dealing with the conflicting interests of multiple stakeholders. And thirdly because they do not properly consider that projects are susceptible to their economic, social and political context and subject to changes in such environment. In this research, two managerial approaches that are being used in the construction industry were identified as having potential contributions to improve value generation in complex projects: the Benefits Realisation Approach (BeReal) and the Lean Project Delivery System (LPDS). The literature available about these approaches is mainly prescriptive. Thus, there is still a need to understand why and how such approaches contribute for value generation. A third approach, the Logical Framework Approach (LFA) used where the problem was identified, was also analysed, as the literature suggests it also offers contributions to deal with some aspects of complexity. This research followed a Design Science Research process: finding a practical problem with potential theoretical contributions, framing the problem and searching for potential solutions, understanding how and why the solutions contribute for solving the problem and analyse the theoretical contributions of the solutions. In this study, emphasis was given to the evaluation of potential solutions identified. Three empirical cases were realised: the first one was in a urban regeneration programme in Brazil, aiming to understand the problem; the second was realised in a healthcare infrastructure programme in the UK, to analyse the adoption of BeReal; and the third in a healthcare infrastructure programme in the US, to analyse the adoption of LPDS. The three studies presented different managerial contributions to support value generation. Such contributions are analysed based on a conceptual framework that was devised. The model reveals the underlying concepts of observed managerial practices that contribute towards the improvement of value generation.

Submitted by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-02-01T18:43:16Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_Anna B. S. Marques.pdf: 10684934 bytes, checksum: 8b3ca4cc6805f148230ed3c759ada015 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-02-01T18:45:39Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_Anna B. S. Marques.pdf: 10684934 bytes, checksum: 8b3ca4cc6805f148230ed3c759ada015 (MD5) / Made available in DSpace on 2018-02-01T18:45:39Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_Anna B. S. Marques.pdf: 10684934 bytes, checksum: 8b3ca4cc6805f148230ed3c759ada015 (MD5) Previous issue date: 2017-12-20 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The success of an interactive system is strongly related not only to the quality of its user interface, but also to the quality of its interaction and navigation mechanisms. Modeling the interaction and navigation of an interactive system can assist designers in making decisions about how the users will be able to achieve their interaction goals. Besides that, modeling the navigational perspective according to how the user interacts with the application helps to obtain navigational paths with greater usability. However, there is lack of proposals to (1) deal with interaction and navigation through an integrated way and (2) deal with usability features in interaction and navigation modeling. In this dissertation, we propose a usability-oriented interaction and navigation model to improve the quality in use of interactive systems. We evaluate the model through a set of empirical studies with subjects with different levels of experience in using models in industry. Our main contributions are: (1) knowledge base about the existing solutions for the problem, (2) the USINN (Usability-oriented Interaction and Navigation) model, (3) empirical evaluations regarding the USINN ease of use, usefulness, benefits and challenges, (4) the evolution of the USINN notation based on theresults of the empirical studies, and (5) the definition of the USINN metamodel. / O sucesso de um sistema interativo está fortemente relacionado não somente à qualidade de sua interface de usuário, como também à qualidade de seus mecanismos de interação e navegação. Modelar a interação e a navegação de sistemas interativos pode apoiar os designers na tomada de decisões sobre como os usuários poderão atingir seus objetivos de interação em uma determinada aplicação. Além disso, modelar a perspectiva de navegação de acordo com a maneira segundo a qual o usuário interage com a aplicação ajuda a obter caminhos de navegação com maior usabilidade. Entretanto, existe uma lacuna por soluções para (1) lidar com a interação e a navegação de maneira integrada e (2) considerar aspectos de usabilidade na modelagem de interação e navegação. Nesta tese, é proposta um modelo para interação e navegação orientado à usabilidade para apoiar a melhoria da qualidade de uso de sistemas interativos. O modelo foi avaliado por meio da condução de um conjunto de estudos experimentais com participantes com diferentes níveis de experiência com o uso de modelos na indústria. As principais contribuições desta pesquisa são: (1) base de conhecimento sobre as soluções existentes para o problema de pesquisa, (2) o modelo USINN (Usability-oriented Interaction and Navigation), (3) avaliações experimentais sobre o USINN em relação a sua facilidade de uso, utilidades, seus benefícios e desafios oriundos de sua adoção, (4) a evolução do USINN com base nos resultados dos estudos experimentais e (5) adefinição do metamodelo do USINN.

For companies that develop and operate IT applications that process the personal data of customers and employees, a major problem is protecting these data and preventing privacy breaches. Failure to adequately address this problem can result in considerable damage to the company's reputation and finances, as well as negative effects for customers or employees (data subjects). To address this problem, we propose a methodology that systematically considers privacy issues by using a step-by-step privacy impact assessment (PIA). Existing PIA approaches cannot be applied easily because they are improperly structured or imprecise and lengthy. We argue that companies that employ our PIA can achieve "privacy-by-design", which is widely heralded by data protection authorities. In fact, the German Federal Office for Information Security (BSI) ratified the approach we present in this article for the technical field of RFID and published it as a guideline in November 2011. The contribution of the artefacts we created is twofold: First, we provide a formal problem representation structure for the analysis of privacy requirements. Second, we reduce the complexity of the privacy regulation landscape for practitioners who need to make privacy management decisions for their IT applications.