Usability and User Experience are two important factors that play a big role in user interaction and design. A poorly designed website can drive users away in frustration, costing a company money. A well-designed website will create a positive user experience, which will help attract new customers. These users will remain the company's customers. The study is looking into whether there is a difference in usability and user experience between two types of webpages. One uses different design principles while the other does not apply to any design principles. This study uses six methods of data collection to investigate the usability and user experience of the astrastad.se website and even find out what actions should be taken to help the company with a usability deficiency. These methods have been implemented to address user problems with using the website. In the study, it was found that there are a great variety of results between the tests.

The use of Linked Data to model and visualize complex information entails usability challenges and opportunities to improve the user experience. This study seeks to enhance the user experience of a product information tool which is developed with Linked Data approach. The research was carried out in an industrial setting and follows the case study paradigm. It consists of 1) user research and literature review to define design requirements, 2) prototyping, and 3) usability testing. The user research produced a list of user experience issues which were in turn translated into design requirements by reflecting on related research and following the user's needs and goals. The design requirements formed the design elements which are embedded into the development of low- and high-fidelity prototypes. Next, usability evaluation of the final high-fidelity prototype examined the extent to which the design decisions could optimize the Linked Data visualization. The results show that several design decisions, such as adding interaction dynamics and the use of rich color representation, could indeed improve it. Also, in terms of general information and visual notation, the shift from UML diagram to node-links diagram received positive feedback from the users. But both node-links diagram and UML diagram received similar scores for the effectiveness and efficiency. / Användningen av Linked Data i syfte att modellera och visualisera komplex information medför både utmaningar och möjligheter för förbättringar när det kommer till användarupplevelsen. Denna studie strävar efter att förbättra användarupplevelsen av ett produktinformationsverktyg som utvecklats med Linked Data-tekniker. Studien är en fallstudie som genomfördes i en industriell miljö och består av: 1) användarundersökning och litteraturöversikt för att definiera designkrav, 2) prototyputveckling, och 3) användbarhetstester. Användarundersökningen resulterade i en lista av problem relaterade till användarupplevelsen, vilken i sin tur översattes till designkrav genom reflektioner kring både tidigare forskning och användarnas behov och mål. De identifierade designkraven utgjorde sedan grunden för de designelement som inkluderades i utvecklingen av High and Low-fidelity-prototyper. Därefter utvärderades i vilken utsträckning de nya designelementen i den slutgiltiga High-fidelity-prototypen kunde förbättra datavisualiseringen. Resultaten visar att designbeslut som att inkludera interaktionsdynamik och rik färgrepresentation kan förbättra användarvänligheten av systemet. Även om både tillvägagångssätt som UML-diagram och Node-Link-diagram fick likartade resultat när det kom till effektivitet, gav skiftet från UML-diagram till Node-Link-diagram en mer positiv respons från användarna när det kom till generell information och visuell notation.

The thesis focuses on the topic of benefits and limitations of various HMI user assessment methods. In the theoretical part of the thesis there is introduced the HMI theory, summarized HMI user assessment methods, presented knowledge about their utilization and the available tools are mapped. The goal of the practical part is testing of selected HMI user assessment methods related to the requirements of the commercial automotive sector. The result of practical part is a comparison of the strengths and weaknesses of individual approaches and their specifics. The diploma thesis was prepared in accordance with the valid internal regulations of the Charles University and other methodological guidelines and normative documents. Keywords: user experience, UX, usability, user interface, UI, HMI, human-machine interface, automotive, usability evaluation, user assessment, user testing, usability testing