Showing papers on "Usability goals published in 2018"

Evaluation of e-commerce websites accessibility and usability: an e-commerce platform analysis with the inclusion of blind users

Abstract: Considering the importance associated with e-commerce website accessibility and usability, a study on one of the most relevant Portuguese e-commerce websites has been performed using both automatic and manual assessment procedures. In an initial stage, we evaluated the chosen website with a Web accessibility and usability automatic tool called SortSite; after that, we performed a manual evaluation to verify each previously detected error and present possible solutions to overcome those faults. In a third phase, three usability specialists have been used to perform a heuristic evaluation of the chosen website. Finally, user tests with blind people were carried out in order to fully assess the compliance with accessibility and usability guidelines and standards. The results showed that the platform had a good score regarding the automatic evaluation; however, when the heuristic and manual evaluations were performed, some accessibility and usability problems were discovered. Moreover, the user test results showed bad marks regarding efficiency, effectiveness, and satisfaction by the group of participants. As a conclusion, we highlight user interaction problems and propose seven recommendations focused on enhancing accessibility and usability of not only the evaluated e-commerce website, but also of other similar ones.

Designing Interaction for Chatbot-Based Conversational Commerce with User-Centered Design

Abstract: Chatbot-based conversational commerce which allows buyers to do online shopping by conversing with chatbot through messaging application has been growing in the e-commerce industry. However, based on studies conducted in this paper, findings show that interaction design of the existing conversational commerce are still lacking in various areas. Therefore, an interaction and interface design for chatbot-based conversational commerce are developed in this study using user-centered design. The outcome of this study is a prototype that fulfills the usability goal and the user experience goal defined for chatbot-based conversational commerce on mobile platform especially for Indonesian users. We conduct usability testing to evaluate the prototype. The results show that the prototype fulfills the defined usability goals and user experience goals as 100% users agree that the prototype is effective to use, efficient to use, easy to learn, enjoyable and helpful, although only 83.3% users agree that the prototype is safe to use.

Framework for evaluating usability problems: a case study low-cost interfaces for thermostats

Abstract: When an evaluation for detecting usability problems is conducted in low-cost thermostat interfaces, several usability problems can show up in one evaluation, and sometimes results are difficult to interpret to correct those problems. If an expert is not implementing, evaluating, and analyzing the test, part of the information could be lost. In addition, designers of interfaces need support in order to provide the most important usability problems. On the other hand, it is important that consumers of low-cost thermostat interfaces use the interface in a correct manner to save energy and time when they are installing and programming the thermostat. Therefore, the usability problems must be eliminated in interfaces before the consumer uses the interface. Thus, the critical usability problems, which drive thermostats to a catastrophe usability problem in the interfaces, have to be found and solved during the design stage to get a successful interface design in the early stages. This paper presents a framework based on information from experts and consumers to solve usability problems. Moreover, it gives a structure and guidelines for designing and evaluating thermostat interfaces. This proposal assumes that it is possible to use information from experts and consumers for detecting and solving usability problems. The framework includes information from experts who rank the usability problems, and then this information is used to design the time on task and success rate evaluations for end users during the design process.

How Acceptable Is It to Monitor Driver State? Using the UTAUT Model to Analyse Drivers’ Perceptions Towards the System

Abstract: This study aims to identify preliminary acceptance and usability goals of a Driver State Monitoring (DSM) system. To demonstrate willingness within a user group to employ DSM technology for the task it is designed to support, the acceptance of the system was investigated using Unified Theory of Acceptance and Use of Technology. Furthermore, a list of ten usability goals was composed and ranked by participants. In total, 95 responses were recorded. The sample consisted of participants of mixed gender and age (M = 34.81, SD = 9.32 years). The measurement and structure model of acceptance was appraised using Structural Equation Modelling. Overall, the model accounted for 22% of the variance in intention to use DSM technology. It was found that the Social Influence factor is the only significant predictor of Behaviour Intention to use a DSM system. To conclude, several implications for researchers and developers of DSM systems are suggested.

A Quality Assessment Model Based on Usability Metrics for M-Health Applications User Interfaces

Abstract: Mobile health (m-Health) applications are gaining popularity for the past few decades. The user interfaces of such applications must be usable and comfortable enough so that they can meet the expectations of their indented users (i.e. doctors, patients etc.). Usability is considered to be one of the key quality factors for measuring the usefulness of such applications which makes usability evaluation a vital task. In this paper, we propose a quality assessment model for evaluating the user interfaces of m-Health applications by reviewing the existing literature and frameworks on the evaluation of user interface designs. The proposed assessment model serves as a base for a comprehensive usability evaluation consisting of major usability goals, subfactors, and metrics. The effectiveness and reliability of the proposed model is measured through two android m-health applications. The results gathered from usability testing and statistical techniques validated that the model is applicable for the evaluation of the m-Health applications and act as a helping tool for evaluators and user interface designers.